Olivia had four times the number of wooden bricks as Ryan. Olivia used all her bricks to build 12 identical cars. Ryan used all his bricks to build 4 identical cars. Olivia used 9 more bricks than Ryan for each car. How many bricks did Ryan have?

	Olivia	Ryan
Number	12	4
Value	1 u + 9	1 u
Total value	12 u + 108	4 u

Number of wooden bricks that Ryan used for each car = 1 u
Number of wooden bricks that Olivia used for each car = 1 u + 9

Number of wooden bricks that Ryan had
= 4 x 1 u
= 4 u

Number of wooden bricks that Olivia had
= 12 x (1 u + 9)
= 12 u + 108

Olivia had four times the number of wooden bricks as Ryan.

4 x 4 u = 12 u + 108
16 u = 12 u + 108
16 u - 12 u = 108
4 u = 108

1 u = 108 ÷ 4 = 27

Number of bricks that Ryan had
= 4 u
= 4 x 27
= 108

Answer(s): 108