Question

What is the answer to 2/3 of something equals 10

Answer 1

In math, when you see the word "of" it usually means "times".

So the question is:

        2/3 times something = 10

Multiply each side of the equation by 3 :

             2 times something = 30

Divide each side by 2 :

                          something = 15

Answer 2

If you want to calculate the fraction of the number, multiply this number by the fraction:

$\frac{2}{3}\times?=10$

therefore

$?=10:\frac{2}{3}=10\times\frac{3}{2}=5\times3=\boxed{15}$