25% of what number is 10?

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Answer 1 · 2018-07-04T19:33:28

$40$

We don't know the number yet, so we can model it with the variable $x$ . The question now turns into:

$25%$ of $x$ is $10$ . What is $x$ ?

The key realization is that $25%$ is the same as $1/4$ , so we can now construct an equation:

$1/4x=10$

This is saying one-fourth, or $25%$ , of a number $x$ , is equal to $10$ .

Let's multiply both sides by $4$ to get

$x=40$

Therefore, $25%$ of $40$ is $10$ .

Hope this helps!