Mathematics Stack Exchange
Mathematics Stack Exchange

Questions tagged [ratio]

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

In mathematics, a ratio is a relationship between two quantities indicating how many times the first number contains the second. For example, if a bowl of fruit contains eight oranges and six lemons, then the ratio of oranges to lemons is eight to six (that is, $8:6$, which is equivalent to the ratio $4:3$). The numbers compared in a ratio can be any quantities of a comparable kind, such as objects, persons, lengths, or spoonfuls. A ratio is written "$a$ to $b$" or $a:b$, or sometimes expressed arithmetically as a quotient of the two.

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Looping through set to select ratios of products by rules

I want to export my products to another marketing platform. My products have different prices and types. I can only export a maximum of 100 and I want to make sure I export 100 exactly if possible. I have a set of criteria rules against which I…
user2470281
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Increasing/decreasing a set of numbers in proportion to match a total

I haven't done much maths for 30 years. I have extensively Googled for a couple of hours but can't seem to find what I need. I have a set of numbers (here's five of them but there's around 50 in total): 20 Red Widgets 30 Blue Widgets 45 Yellow…
user2470281
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Doubt regarding ratios

Consider a problem, there are three types of products X ,Y ,Z costing 532,504 and 486 bucks respectivel.A person buys A, B and C number of X, Y and Z respectively such that A+B+C is 37 and the average cost per product of the final mixture is 506.We…
Mohan
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Time and work problem found to be hard

First pipe passes 4 liters of water per minute less then second pipe. How many liters of water per minute passes through the first pipe if it fills a 480 liter basin 8 minutes longer than the second pipe fills a 384 basin?
user686442
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Apples, Bananas and Oranges

I am having a very slow Friday and cannot think of how to describe my problem in mathematical terms... I have 10 children who each must get an apple, a banana and an orange. Apples come in bags of 3, bananas in bunches of 7 and oranges in bags of…
Malteaser6900
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How can I calculate the ratio required to line up these rectangles?

I have two rectangles of different sizes which need to slide horizontally, left and right. The left side of each rectangle needs to line up above P1 when the rectangles are fully right (diagram A). Now I know that if the larger rectangle is twice…
Aidan
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I was wondering how I can solve this question as I'm a bit stuck.

$P, Q$, and $R$ are each mixtures of red and white paint. The percentage by volume of red paint in $P$ is $30\%$. The percentage by volume of red paint in $Q$ is $20\%$. The mixtures $P, Q$, and $R$ are combined in the proportion $12 : 5 : 3 $…
Siddharth Chaudhary
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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. Image sizes need to be scaled down or up…
Milos Bejda
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ratio calculation problem, can someone help?

the problem is like this : an online recipe calls for 2 liter of 3% bleach to 50 liter of water. so, how many liter of 11% bleach to 50 liter of water ? anybody able to teach me ? thanks andrew
andrew_ysk
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Can one combine proportions like so?

If $$y \propto x$$ and $$y \propto \frac1z$$ does this imply $$y \propto \frac{x}{z}$$ is true? I've tried a few cases and it has worked every time, however I can't find any information on the internet and I'm not sure how to derive a proof.
user668526
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Two parts of first ratio and one part of second ratio

I was preparing for Quantitative aptitude exams and I came across this question of ratios An alloy contains copper and zinc in ratio 5:2 and another alloy contains zinc and tin in the ratio 3:2. If 2 parts of 1st alloy and one part of second alloy…
Masroor
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Equation for Comparing Autos

I am buying a used vehicle. I want an equation that will allow me to compare two vehicle's value that are identical in every way except price and mileage. For example: Car A: $20395 cost and 83400 miles Car B: $17090 cost and 10500 miles Car C:…
Frank
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Currency growth rate (reverse)

For currency audusd: On opening of Day1 the price is 20 and on closing of Day1 the price is 35 So the growth rate is (35-20)/20 = 0.75 So, for usdaud (reverse pair) the price at opening of Day1 will be 1/20 and the price at closing of Day1 will be…
Paul
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Ratios containing zero

In one of our questions in school, we are asked, For a given index finger length which of the following groups has the longest ring finger if the $2$D:$4$D ratio is: Group A $0.96$, Group B $0.98 $ Group C $0.99$ and Group D $1.01$. [Definition:…
Michelle
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Calculate adherence using proportion

My task is to calculate adherence of people. If $0$ minutes = $100\%$; $9600$ minutes = $0\%$; what are $480$ minutes equal to?
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