3/5 of a number is 30. What's the number?

33 1/3

Step-by-step explanation:

Let the number be a.

Of means multiplication.

So,

3/5 x a = 20

3a/5 = 20

Cross multiply

3a = 20 x 5

3a = 100

Divide both sides by 3

3a/3 = 100/3

a = 33 1/3

The number is 33 1/3.

If you multiply 3/5 by 33 1/3, the answer will be equal to 20.

If 3/5 of a number is 30 then divide 30 by the numerator (3 in this case) and then multiply by the denominator (5 in this case) and you will get 50