Question

Two- thirds of a number added to itself is 20. what is the number?

Answer 1

First, to write your equation you can refer to this number as a variable x.

So,
X + 2/3X = 20

Next you want to combine like terms, and you will get 5/3X

So now we will have:
5/3X = 20

To get X by itself you must divide by 5/3, which is the same as multiplying the number by 3/5.

20 X 3/5 = 12
The answer is that the number is 12

Answer 2

Equation

Let the number = x

(2/3)x + x = 20                   Change the x to thirds.

(2/3)x + 3/3x = 20              3/3 = 1 Now  combine the like terms.

(2 + 3)/3 = 20                     2/3 + 3/3 = 5/3  

(5/3) x = 20                        Multiply both sides by 3/5

(5/3)*(3/5)x = 20*3/5        Complete the multiplication on the right

x = 4 * 3                            Combine

x = 12                                 Answer