Question

Robert earned $4 each hour doing chores for his neighbors. He also earned $20 working for his mother. Altogether, Robert earned $80. In the space below, write an equation that shows this situation. Use your equation to nd the number of hours Robert worked doing chores for his neighbors.

Answer 1

Let x = hours that he worked

4x + 20 = 80

- 20. - 20

4x = 60

--- ----

4 = 4

x = 15

Hope that helps :)

Answer 2

Answer:

15 hours

Step-by-step explanation:

$(4 \times n) + 20 = 80 \\ (4 \times n) = 80 - 20 \\ (4 \times n) = 60 \\ 60 \div 4 = n \\ 15 \: hours$