Emma had thrice the number of rubber bricks as Wesley. Emma used all her bricks to build 10 identical ships. Wesley used all his bricks to build 5 identical ships. Emma used 9 more bricks than Wesley for each ship. How many bricks did Wesley have?

	Emma	Wesley
Number	10	5
Value	1 u + 9	1 u
Total value	10 u + 90	5 u

Number of rubber bricks that Wesley used for each ship = 1 u
Number of rubber bricks that Emma used for each ship = 1 u + 9

Number of rubber bricks that Wesley had
= 5 x 1 u
= 5 u

Number of rubber bricks that Emma had
= 10 x (1 u + 9)
= 10 u + 90

Emma had thrice the number of rubber bricks as Wesley.

3 x 5 u = 10 u + 90
15 u = 10 u + 90
15 u - 10 u = 90
5 u = 90

1 u = 90 ÷ 5 = 18

Number of bricks that Wesley had
= 5 u
= 5 x 18
= 90

Answer(s): 90