# Questions tagged [ratio]

For questions concerning the ratio of a certain quantity to another.

187 questions
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### Are my calculations of the pregnancy ratio of the population correct?

So this question is a math question having to do with me calculating the rate of population growth starting from a population of 100,000. I have already gotten the first 3 steps done(sex ratio, ratio ...
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### Ratio of Radius of Circle $B$ to Radius Of Circle $A$ in the form $a + b\sqrt{c}$

The full question is as follows: Suppose $X, Y, Z$ are three different, circles of equal radius which are mutually tangent. Let circle $A$ be the circle tangent to $X, Y$, and $Z$ inside the gap ...
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### Fitting the ratio of skew normal distributions

I have two probality functions that are following a skew normal distribution. I compute the ratio between these functions. Can I approximate this ratio with a skew normal distribution also? Do you ...
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### What does a confidence interval tell you about the relationship between two things?

So I have found a 95% confidence interval for the odds ratio of developing cancer with vitamin A intake. My sample odds ratio was 1.1667 with a 95% confidence interval of (0.5394, 2.5227). I am then ...
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### How to do this ratios problem without algebra?

Dinesh had some fiction and nonfiction books. The number of fiction was $4/9$ of the total number of books. After he had donated $80$ fiction books and $25$ nonfiction books, there were $20\%$ as many ...
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### Selecting rational numbers with maximum ratio of (sum of nummerator)/(sum of denominators)

I have n rational numbers. Out of that I have to select m numbers such that sum of numerators of m numbers /sum denominators of m numbers is maximum. e.g. ...
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### What function describes the frequency for each unique ratio for all possible expansions n over d where n<d?

I am hoping to solve the following problem for a scientific investigation, which relies on the probabilites of all possible expansions. What function $f(r)$ describes the frequency for each ratio for ...
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### Width and height ratio of object in image

I hope I ask this in the correct place. How do I get the width and height ratio of for example a sheet of paper (or some other rectangular thing) from a image. I have built a program that that ...
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### How do I calculate the aspect ratio of a width and height?

I am creating an image upload form. I want to restrict users from uploading images that are not of the aspect ratio of 16:9. What is the formula for calculating an aspect ratio such as this? If w = ...
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### Dividing contents with ratios

I'm taking a mock test and there is a relatively straight forward question that I am not sure about. ...
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### Variance of ratios of correlated values

I want to estimate a scaling factor $s$ between two vectors of scalars $a$ and $b$. In the ideal case it would be constant for all components, so $a = s \cdot b$, however there is some noise in the ...
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### What formula would I use to scale multiple images to fit in a canvas?

I’m trying to tile random square images with a fixed width and height on a rectangular canvas. The number of images that need to be tiled is a variable. All of the images need to show on the canvas. ...
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### Is any line inside similar triangles is scaled with same similarity ratio like median, height, bisector?

In two similar triangles their median, height, angle bisector and perpendicular bisector (upon middle of a side) are all scaled like perimeters (with same similarity ratio). But can I say so for any ...
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### Ratios and rounding figures to nearest thousand

I'm using the WHO Suicide Statistics to try and ascertain the rate of suicide per 100,000 of the population. I'm afraid I'm not from a maths background and this is the first time using Stack ...
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### Mixing two different essential oils to their maximum safe dilutions in one carrier oil

I want to mix cinnamon bark essential oil (safe at a maximum 0.5% dilution) with tea tree essential oil (safe at a maximum 15% dilution) in shea butter. Shea butter is safe undiluted. The above ...
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### Whats the best way of solving this ratio problem?

I have a question relating to a school report that I submitted, essentially I was asked to prove why a certain value ($x_1$) had a large increase (40%) as compared with a second value ($x_2$). I ...