Question

I was given this problem in math and can’t figure out how it’s solved. 21 is 70%of ___?

Answer 1

The answer is 30

Explanation:

Given:

21 is 70%of ___

Let,
`x` in the place of blank to solve.

So,

`21=(70)/(100)* x\\ 21=(70x)/(100)`.

Multiply both sides by
`100`.

`21*100=(70x)/(100)*100\\2100=70x`.

Now, dividing both sides by
`70`.

`(2100)/(70)=(70x)/(70)\\30=x`.

So, the value of
`x=30`.

Therefore, the answer is 30.