# 21 is 25 percent of what number?

Answer: 21 is 25 percent of 84

## Fastest method for calculating 21 is 25 percent of what number

Assume the unknown value is 'Y'

21 = 25% x Y

21 = 25 / 100 x Y

Multiplying both sides by 100 and dividing both sides of the equation by 25 we will arrive at:

Y = 3 x 100 / 25

Y = 84%

Answer: 21 is 25 percent of 84

If you want to use a calculator, simply enter 21x100÷25 and you will get your answer which is 84

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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% / Y = 25% / 21

Drop the percentage marks to simplify your calculations: 100 / Y = 25 / 21

Multiply both sides by Y to move Y on the right side of the equation: 100 = ( 25 / 21 ) Y

Simplifying the right side, we get: 100 = 25 Y

Dividing both sides of the equation by 25, we will arrive at: 84 = Y

This leaves us with our final answer: 21 is 25 percent of 84