Joelle had four times the number of plastic bricks as Glen. Joelle used all her bricks to build 8 identical cars. Glen used all his bricks to build 5 identical cars. Joelle used 9 more bricks than Glen for each car. How many bricks did Glen have?

	Joelle	Glen
Number	8	5
Value	1 u + 9	1 u
Total value	8 u + 72	5 u

Number of plastic bricks that Glen used for each car = 1 u
Number of plastic bricks that Joelle used for each car = 1 u + 9

Number of plastic bricks that Glen had
= 5 x 1 u
= 5 u

Number of plastic bricks that Joelle had
= 8 x (1 u + 9)
= 8 u + 72

Joelle had four times the number of plastic bricks as Glen.

4 x 5 u = 8 u + 72
20 u = 8 u + 72
20 u - 8 u = 72
12 u = 72

1 u = 72 ÷ 12 = 6

Number of bricks that Glen had
= 5 u
= 5 x 6
= 30

Answer(s): 30