# 15 is what percent of 21?

Answer: 15 is 71.429 percent of 21

## Fastest method for calculating 15 is what percent of 21

Assume the unknown value is 'Y', and 15 of 21 can be written as:

Y = 15 / 21

By multiplying both numerator and denominator by 100 we will get:

Y = 15 / 21 x 100 / 100 = 71.429 / 100

Y = 71.429%

Answer: 15 is 71.429 percent of 21

If you want to use a calculator, simply enter 15÷21x100 and you will get your answer which is 71.429

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## Have time and want to learn the details?

Let's solve the equation for Y by first rewriting it as: 100% / 21 = Y% / 15

Drop the percentage marks to simplify your calculations: 100 / 21 = Y / 15

Multiply both sides by 15 to isolate Y on the right side of the equation: 15 ( 100 / 21 ) = Y

Computing the left side, we get: 71.429 = Y

This leaves us with our final answer: 15 is 71.429 percent of 21