Rafael counted a total of 40 white cars and yellow cars. There were 9 times as many white cars as yellow cars. How many white cars did Rafael count?

Question

Common Core Standard

Answer 1

Let x = the number of yellow cars

Let 9x = the number of white cars

x + 9x = 40

10x = 40
x = 4 yellow cars

9x = 9(4) = 36 white cars