A percentage is a number or ratio expressed as a fraction of $100$. It is often denoted using the percent sign, "$\%$", or the abbreviation "$\mathrm{pct}$." -Wikipedia. Percentages are used when describing portions or proportional changes.

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Find the percent of boys and girls

I have a basic school academic question which despite of trying very hard I was unable to find a solution - Average score of girls is an exam is $67$ and that of boys is $62$. Find the percentage of ...
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2answers
21 views

What is the probability or percentage or frequency by which hello line will be printed?

I have a below method which is called every one minute from background thread and that background thread keeps running always. ...
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0answers
16 views

Random selection in percentage

I have $3$ lists of things. I want to choose things randomly from this lists. But have percentage limitation on the lists. Like I can select only $60$% things from $1$st list, $30$% from $2$nd list ...
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1answer
8 views

calculating percentage formula for service fee

I am working on an application that integrates with a payment service that charges a fee to use. I'm trying to come up with a formula, so I'll ask my question in a different format so that I don't ...
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0answers
4 views

increase percentage weighted

I want to compare two series of data and wish to identify significant differences between the two. Say I have a value of 21.14 in Series 1 and 21.01 in Series 2, if I use the standard percentage ...
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1answer
40 views

Probabilty using percentage [closed]

In some hours, I have a final exam but I didn't understand how to do this exercise. Can someone explain me please the steps ? The question is: I got this answer from our adviser, but I don't ...
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1answer
20 views

Calculating a weighted average for different pay rates and different hours.

I'm trying to take the money earned over several days - each with unique hours worked and dollars earned per hour (hrs and $/hr). What I've done is multiply each days' # of hours by its rate to get ...
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1answer
12 views

Labeling the percentages in a $24$ hour day [closed]

In a $24$ hour period, the $12^{th}$ hour would mark $50 \%$ of that time period. I want to show the percentages on my graph of time frames in a $24$ hour period, how do I figure out the percentage of ...
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2answers
30 views

Probability of C occurring given both A and B have occurred?

The problem is as follows: Tags are used to classify images. An image with the tag "sky" has 90% chance of containing a sunset, with the tag "cloud" giving an image 50% chance of containing a ...
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1answer
20 views

How would I go about calculating values for distributed percentages?

This might be really simple, but I just can't see it. I'm working on a game that has 8 items each with a (arbitrary) probability (% chance) of being found: ...
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0answers
48 views

Working out averages for goals scored per football game

If for example I had a sample set of 11 football games. Of those 11 games, there were a total of 8 goals. So I can work out the average goals per game by ...
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0answers
16 views

Then find how much pass in both given the following conditions?

In an Examination 35% fail in maths,25% fail in English.If 10% fail in both the subjects.Then find how much pass in both. MyApproach Using VennDiagram 10% fail in both=>25% fail in only maths ...
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1answer
18 views

How many can speak English given the following conditions?

In a class of 60 students,40% speak only Hindi(H).25% speak only English(E) and the rest can speak both the languages.How many speak English. MyApproach Using VennDiagram,I see $40$% only H and ...
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5answers
49 views

380 is what percent less than 600?

I'm New to percentages and this sum is confusing me a bit. If the question was " 380 is what percent of 600" , I would have converted it to an equation as follows.. 380 = ?% × 600 'n then I could ...
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1answer
13 views

Percentage and Geometry Relations

I would like to know the approach for followings: Que 1: Volume of Cube is increased by $72.8$%, determine the % increase, in the side of the cube. My Approach: Step 1: Volume of Cube = $a^3$ ...
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2answers
19 views

Percentage and numeric relations

I would like to know the simplest approach to the followings: Que 1: One student scored $14$ marks more than the other and his marks were $60$% of the sum of their marks. Find marks obtained by ...
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4answers
28 views

Relation between ratio and percentage

I would like to know easiest method to solve following: Que: If $p$ is $128$% of $r$, $q$ is $96$% of $r$ and $r$ is $250$% of $s$, find the ratio of $p$:$q$:$s$. My Approach: Step 1: $p ...
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1answer
17 views

Percentage relations between x and y.(Relation between two variables)

I would like to know easiest method to solve following: Que 1: If 10% of x=y, then y% of 30 is same as what % of x? My Approach: Step 1: (10 * x)/100 = (10 * y)/100 Step 2: (30 * y)/100 = (3 * ...
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2answers
37 views

5 grades into 4 percentages. English teacher in need of help.

I have five numbers, three of them each represent 25% of an average and the last two are the remaining 25%. One the last two numbers is 10% and the other 15%, how do I add them up into one number ? I ...
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4answers
21 views

How to compute the percentage of difference between two values?

If there are two real values called week1val and week2val, what operation is required to calculate the percentage of difference between the two values? Does the higher of the two values need to be ...
2
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1answer
18 views

Question referring to percentage increase

Why if you evaluate the percentage increase between the first and last number of a sequence it doesn't equalize with the partial sum of the increases? Suppose you have the sequence $1,3,6$. The ...
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0answers
10 views

Calculating percentage of a variable in a simple divide by equation.

I have a result calculated by dividing $x$ by $y$. I have to now figure out what percent is the impact of $x$ and $y$ on the result. Ex. $X=10$ and $Y = 4 $. Result $= 10/4 = 2.5$. I need to determine ...
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2answers
46 views

If the chance of an event was $1/128$ and increased by $20\%$, what is the new chance?

So I have something that has a 1/128 chance of occurring, let's say. Suddenly, the chances of that thing happening are increased by 20%. How is that fraction written? Would you multiply 1/128 by ...
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0answers
19 views

Total value after percentage increase

This question came by on a numerical reasoning test. To bad the answers were not provided afterwards. I have a feeling this should be easy, but what am I missing? I made a screenshot of the ...
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1answer
9 views

How to find Cost Price (C.P.) of an article in this problem?

A man sells an article at a gain of 12.5%.If he had sold it at Rs 22.50 more, he would have gained 25%. The C.P. of the article is?
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3answers
41 views

Profit and loss - using false weights

A shopkeeper cheats to the extent of 10% while buying and selling by using false weights. His total gain is This looked as a simple question to me. But when I searched for answers, i could see ...
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3answers
45 views

Intuitively, why is compounding percentages not expressed as adding percentages?

I pursue only intuition; please do not answer with formal proofs. I already know the theoretical reason: because each percentage expresses a different base. $1.$ But why not intuitively? My ...
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0answers
19 views

Find a percentage value based on other percentage values.

Okay, let me start off by saying, I do not particularly know what I am doing... Unfortunately I never had a strong background in math... That being said, I have been told that this is middle school ...
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1answer
25 views

Find original cost based on fractional purchase

How would I go about finding the original cost of bitcoin knowing that $20 purchased .0531401 of bitcoin? I would like to know what the cost of 1 bitcoin was at the time of purchase? ...
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2answers
32 views

Does a game need below-average players

I am no mathematician, just a programmer and gamer who thought about this problem. I reckoned it's more relevant here than one of the gaming-SEs, as it's not really about any particular game, but ...
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1answer
43 views

Calculating percentages of percentages

I am having a really hard time grasping how to effectively calculate "nested" percentages and the actual amount I save on each iteration Example: I purchase a gift card (Gift Card A) that has a ...
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2answers
19 views

Reverse percentage reduction formula

Consider i need to reduce a value by percentage 100 - 10% = x 100 - (100 * 10 / 100) = 90 So we know x is ...
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1answer
19 views

Buses - percents

We say that a bus is overcrowded if at some moment there is at least 50 passengers in it. Two inspectors are monitoring the number of passengers in 10 buses. One of them computed what is the ...
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0answers
21 views

3 variable concept equation involving items and probabilities

I'm working on a project for an experiment I'm trying to run and my probabilities math is incredible rusty/non-existent. I have 4 quadrants and each quadrant has 5 + random items and 4 + items which ...
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0answers
24 views

Calculating percentage of range of values given total set members and average (review ratings)

Given the total number of members in an unknown data set, with values ranging from a minimum of 1 to a maximum of 5, is it possible to determine the probable percentage of values that fall within a ...
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2answers
57 views

How much better (as a percentage) is $A$ than $B$? [closed]

This may sound stupid, but is it correct to say $100$ is a hundred percent better than $50$ where by better I mean higher or something like that. Similarly would it be correct to ask questions ...
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4answers
44 views

If I know values for 0% and 100%, how can I calculate the value at 90%?

If I have 2 values, one representing 0% of a range (lets say 1.0), and another value representing 100% (lets say 20.0), how would I work out what value 90% would be? A formula would be handy if poss. ...
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2answers
16 views

Help with percentage

Can someone please explain how to calculate "percent more than" and "percent less than"? I know $35$ is $75$ percent more than $20$ - but no idea how to calculate it. Also trying to figure out how ...
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1answer
18 views

What are the percent chances of rolling a number when you roll two dice and take the higher number?

Say I roll two twenty-sided dice and always take the higher number rolled, and dispose of the lower number. What are the percent chances of rolling each number on the die? I tried the equations in ...
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1answer
43 views

If M is $150\%$ of $N$, then $N$ is what percent of $M + N$?

My solution was very naive: Let $N = 100$. Then, $M = 150$. Then, $$\frac{N}{N+M}= \frac{100}{100+150}= 0.40$$ which corresponds to $40\%$. Therefore $N$ corresponds to $40\%$ of $M + N$. I think ...
4
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2answers
40 views

What percentage drop is this?

Can someone help a student who is terribly bad at math answer this question? Between 1998 and 2014, in New Mexico, Birth rates for teens 18-19 years of age fell from a rate of 108.8 per 1000 to 69.3 ...
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2answers
26 views

What's the correct terminology for these two types of percentages?

You can represent a value reducing by 20% as either: -0.2 or 0.8 Likewise, if a value increases by 20%, you can represent this change as either: +0.2 or 1.2 Your equations clearly need to be aware ...
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1answer
29 views

How to standardize percentages

Assume I have a company that issues 500/1000 contracts and 100 of those contracts are bad, and I have another company, company 2, that issues 200/1000 contracts and 100 of those contracts are bad, ...
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2answers
36 views

If increased by $10\%$ is $15$, what's the original number? [closed]

Let's say we have $x$ and we increase $x$ by $10\%$, $x$ becomes $15$, what is $x$? And what is the formula to solve this kind of problem? Can't remember it anymore and googling gave solutions to ...
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0answers
6 views

How to find the most similar group comparing to another group in percentages?

I am trying to understand a simple experiment: I have a reference population results of 1000 people. 20% people like red colour 35% like green 15% like yellow 30% like blue then, I have other ...
2
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2answers
36 views

If my salary grew from \$1,200 a month to \$1,300 a month, did I get \$100/\$1,200 = 8.3 % increase or \$100/\$1,300 = 7.7 % increase?

I'm math amateur. I was just given a raise at my job and my salary grew from $\$1,200$ a month to $\$1,300$ a month. I'm trying to figure out percentage growth in my salary. Did it grow ...
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2answers
37 views

How to calculate double time percent increase?

Suppose that I have initial value 88. Now we increase 88 a certain amount of percentage and then also we increase another certain amount of percentage. And the final value is 112. What percent I have ...
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1answer
14 views

How to find the percent variation in Y is explained by X?

I know that the r^2 value for the data is 0.9832. Is there a way to use that value to find the percent variation in Y is explained by X? Or do I need to use the data given to me?
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2answers
30 views

A mixture of two kinds of beef has a total fat content of 8%; find the ratio of the mixture

I am struggling a bit on weighted average problems on the GMAT. I'm a bit confused as to how they work and the best way to solve them. I'm kind of relying on intuition, but I'd like a more formal way ...
0
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1answer
24 views

Standard Deviation and Mean using Chebyshevs Theorem

Find the standard deviation and mean when The sale prices of 88.9% of the homes in a certain neighborhood were between \$438,572 and \$189,992. From Chebyshevs theorem it is known that 88.9% is 3 ...