Question

Julio cubes a number then takes the cube root of the result. He ends up with 20. What number did Julio start with

Answer 1

Let us say that the number is x.

So the first step that Julio do is to cube the number so that:

x^3

Then the next he did was take cube root of the number, so that:

(x^3)^(1/3)

 

Solving this would result in:

x^(3/3) = x^1 = x

Since he ends up with 20, therefore:

x = 20

 

Julio started and ended with the same number which is 20.