Ratio of 21 to 80 (21:80)

Ratio of 21 to 80

A ratio of 21 to 80 can be written as 21 to 80, 21:80, or 21/80. Furthermore, 21 and 80 can be the quantity or measurement of anything, such as students, fruit, weights, heights, speed and so on.

A ratio of 21 to 80 simply means that for every 21 of something, there are 80 of something else, with a total of 101.

In the box below, you can enter a number in either box and we will calculate the other number to keep the ratio of 21 to 80. In other words, we will calculate the corresponding equivalent ratio of 21:80 for you.

To calculate the left side of the ratio, our calculator multiplies the right side by 21 and then divides the product by 80. To calculate the right side of the ratio, our calculator multiplies the left side by 80 and then divides the product by 21. Answers are rounded to two decimals if necessary.

Below is a list of equivalent ratios of 21:80 that we created using our 21:80 ratio calculator above.

21:80

42:160

63:240

84:320

105:400

126:480

147:560

168:640

189:720

210:800

231:880

252:960

We have also created a pie chart for you to put 21:80 ratio in perspective. To do so, we divided a pie into 101 pieces and then colored 21 pieces green and 80 pieces blue. The pie will look exactly the same using any equivalent ratio of 21:80.

21 to 80 pie ratio

The green part of the pie covers 20.79% and the blue part covers 79.21%. To calculate the percentages, we divided each side of the ratio by its total and then multiplied by 100, like this:

(21 / 101)×100 ≈ 20.79
(80 / 101)×100 ≈ 79.21

In fractional terms, 21/80 of the pie above is colored in green. This means that the ratio of 21 to 80 or 21:80 can also be expressed as a fraction, where the 21 to the left of the colon is the numerator and the 80 to the right of the colon is the denominator:

21:80 = 21/80

Ratio is often used when defining rectangles in width:height format. Width and height can be feet, inches, centimeters, or any other kind of length. With a ratio of 21 to 80, the width is 21 and the height is 80. Below is a picture of what a rectangle with a ratio of 21:80 looks like.

21 to 80 pie rectangle

Since the simplest form of the fraction 21/80 is 21/80, the simplest form of the ratio 21:80 is also 21:80.

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Ratio of 21 to 81
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