Question

Write an equation to represent that 1/3 of the sum of 20 and a number equals 8. What is the number?

Answer 1

x=4

Explanation:

1/3 (20 + x) = 8

multiply both sides of equation by reciprocal of 1/3

3/1 * 1/3 (20 + x) = 8 * 3/1

20 + x = 24

subtract 20 from both sides

x = 4