Joelle had five times the number of wooden blocks as Julian. Joelle used all her blocks to build 10 identical houses. Julian used all his blocks to build 5 identical houses. Joelle used 9 more blocks than Julian for each house. How many blocks did Julian have?

	Joelle	Julian
Number	10	5
Value	1 u + 9	1 u
Total value	10 u + 90	5 u

Number of wooden blocks that Julian used for each house = 1 u
Number of wooden blocks that Joelle used for each house = 1 u + 9

Number of wooden blocks that Julian had
= 5 x 1 u
= 5 u

Number of wooden blocks that Joelle had
= 10 x (1 u + 9)
= 10 u + 90

Joelle had five times the number of wooden blocks as Julian.

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

1 u = 90 ÷ 15 = 6

Number of blocks that Julian had
= 5 u
= 5 x 6
= 30

Answer(s): 30