# 45 is 20 percent of what number?

Answer: 45 is 20 percent of 225

## Fastest method for calculating 45 is 20 percent of what number

Assume the unknown value is 'Y'

45 = 20% x Y

45 = 20 / 100 x Y

Multiplying both sides by 100 and dividing both sides of the equation by 20 we will arrive at:

Y = 3 x 100 / 20

Y = 225%

Answer: 45 is 20 percent of 225

If you want to use a calculator, simply enter 45x100÷20 and you will get your answer which is 225

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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 = 20% / 45

Drop the percentage marks to simplify your calculations: 100 / Y = 20 / 45

Multiply both sides by Y to move Y on the right side of the equation: 100 = ( 20 / 45 ) Y

Simplifying the right side, we get: 100 = 20 Y

Dividing both sides of the equation by 20, we will arrive at: 225 = Y

This leaves us with our final answer: 45 is 20 percent of 225