The quantitative-aptitude tag has no wiki summary.
0
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2answers
89 views
A completes 36% work in 12 days.
A completes 36% work in 12 days.
B is twice as fast as A.
C is twice as fast as B.
How many approx days are required for finishing the remaining 64% work if all of them work together.?
a)2 b)4 ...
0
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2answers
134 views
Clock puzzle.. Bit tricky
Twin Sisters A and B bought 2 wristwatches at 12 p.m .
An Hour later , A's watch reads 1:02 p.m while B's watch reads 12:56 p.m.
Later , on same day : If A's watch reads 10 p.m then at that time ...
0
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2answers
53 views
Help understanding train problem
A train $150$ $m$ long passes a km stone in $15$ seconds and another train of the same length traveling in opposite direction in $8$ seconds. The speed of the ...
1
vote
2answers
108 views
If A divided by B is equal to C and C is larger than D …
If A divided by B is equal to C and C is larger than D, and all these number are positive whole numbers other than one, it follows that
A is always larger than D
B is always smaller than C
B is ...
1
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2answers
135 views
Time & Work Problem
12 men do a work in 36 days.In how many days can 18 men do the same work?
Sol:This can be solved as
1 man's can do work in 12*36 days
So,1 man's 1 day work (1/12*36) days
Hence 18 men's 1 day work is ...
1
vote
3answers
345 views
Percentages - Find Maximum value.
3 candidates A,B and C contest an election. A gets at least 40% of all the votes. B gets at least 20% of the number of votes that A gets and cannot get more than 80% of number of votes that c gets. ...
4
votes
4answers
258 views
Finding remainders of large number
This question was asked in a competitive exam.
Find the remainder of dividing $6^{83}+ 8^{83}$ by $49$
Are there any theorems/rules to compute the answer ?
11
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5answers
458 views
Divisibility of large number
This was a question asked in a competitive exam:
$(300^{3000} -1 )$ is divisible by
a) $401$ b) $501$ c) $301$ d) $901$
The answer is $301$. Not sure how they arrived at the answer. Can ...
1
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1answer
109 views
Finding change in total surface area of a cone
If the height of a cone is decreased by 20% whereas its radius is increased by 25% , can we find the percentage increase in total surface of the cone ?
With the above information , I am trying to ...
3
votes
3answers
215 views
HCF/LCM problem
Find the greatest number that will divide $x$, $y$ and $z$ leaving the same remainder in each case.
Now the solution for this is obtained by finding the HCF of $(x – y)$, $(y – z)$ and $(z – x)$.
...
3
votes
4answers
433 views
Finding last digit of numbers raised to large powers
This question came in a competitive exam I took recently.
The last digit of LCM of $3^{2003} - 1$ and $3^{2003} + 1$ is
is there any strategy by which we can quickly determine the answer? I am ...
1
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1answer
43 views
Find the minimum number of tests
Sorry for the title, but I couldn't think of something else, its not actually homework, but rather a question from a maths question book I am currently stuck on, but still I've tagged it in homework. ...
1
vote
3answers
68 views
Smallest number in a set
A is the set of seven consequtive two digit numbers, none of these being multiple of 10. Reversing the numbers in set A forms numbers in set B. The difference between the sum of elements in set A ...
1
vote
1answer
64 views
Why are we adding instead of subtracting?
The problem statement:
Distance between two stations A and B is 230 km. Two motorcyclist
starts simultaneously from A and B in opposite directions and the
distance between them after 4 hours ...
1
vote
1answer
232 views
If $(1.001)^{1259} = 3.52$ and $(1.001)^{2062} = 7.85$, then $(1.001)^{3321}= ?$
If $(1.001)^{1259} = 3.52$ and $(1.001)^{2062} = 7.85$, then $(1.001)^{3321}= ?$
what should be the approach in-order to get a solution without electronic aid?
3
votes
3answers
213 views
Deriving two properties of clocks
This two properties are given in my module as formulas for clock related problems:
$(1)$ If both the hands start moving together from the same position, both
the hands will coincide after $ ...
1
vote
1answer
166 views
Which is the fastest way to solve these two problem?
I have two problems which are based on the sequence $A007376$.
Natural numbers starting with $1$ are written one after another like $123456789101112131415\cdots$, how could we find the $10^4$th ...
0
votes
1answer
151 views
$90!$ when divided by $n$, gives an odd number. What can be the minimum and the maximum values of $n$?
$90!$ when divided by $n$, gives an odd number. How could we find the minimum and the maximum values of $n$?
I am not sure how to approach this one, any ideas?
1
vote
2answers
53 views
Which of the following is necessarily a divisor of the number $n\times1000+2 \times n$ where $n\lt 500$?
A three-digit number 'n' (less than 500) is taken. A six-digit number is formed by writing the number 'n' as first three digits and the number '2n' as the last three. Which of the following is ...
1
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2answers
160 views
How to find the minimum value of $px+qy$ when $xy=r^2$?
The question says: "Find the minimum value of $px+qy$ when $xy=r^2$."
No information is given on $p,q,x,\text{and }y.$ However assuming the obvious I tried using this, but I am not able reduce it to ...
5
votes
1answer
121 views
If $f(x)$ is a polynomial satisfying $ f(x)f(\frac 1x) = f(x)+f(\frac 1x)$ and $f(3)=28$, then how could we find $f(4)$?
If $f(x)$ is a polynomial satisfying $ f(x)f(\frac 1x) = f(x)+f(\frac
1x)$ and $f(3)=28$, then how could we find $f(4)$ ?
1
vote
4answers
126 views
How much percent new content does Grandpa write in the morning?
Grandpa is writing a book. Every morning he starts writing vigorously and fills a lot of pages. But post-lunch he goes through all that he's written that far (right from day one) and deletes one-fifth ...
3
votes
1answer
232 views
Is there any international aptitude test for college-level mathematics that can help Graduate Admission?
Is there any international aptitude test for college-level mathematics that can help Graduate Admission?
Is there any agency that conduct such a test?
8
votes
2answers
256 views
Number of zeros not possible in $n!$ [duplicate]
Possible Duplicate:
How come the number $N!$ can terminate in exactly $1,2,3,4,$ or $6$ zeroes but never $5$ zeroes?
The number of zeros which are not possible at the end of the $n!$ is:
...
7
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4answers
226 views
Word based problem with percentages
If your salary is increased by 10% and then after 6 months by a further 50%, what is the overall % increase?
7
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5answers
872 views
If a second car leaves later at a higher speed, how long will it take to catch up?
If a Skoda sets off at an average speed of 20 miles per hour at 7 am and a Porsche sets off at an average speed of 40 miles per hour at 4 pm in the same direction, at what time will the Porsche catch ...
