Wendy had four times the number of rubber blocks as Vaidev. Wendy used all her blocks to build 10 identical cars. Vaidev used all his blocks to build 4 identical cars. Wendy used 9 more blocks than Vaidev for each car. How many blocks did Vaidev have?

	Wendy	Vaidev
Number	10	4
Value	1 u + 9	1 u
Total value	10 u + 90	4 u

Number of rubber blocks that Vaidev used for each car = 1 u
Number of rubber blocks that Wendy used for each car = 1 u + 9

Number of rubber blocks that Vaidev had
= 4 x 1 u
= 4 u

Number of rubber blocks that Wendy had
= 10 x (1 u + 9)
= 10 u + 90

Wendy had four times the number of rubber blocks as Vaidev.

4 x 4 u = 10 u + 90
16 u = 10 u + 90
16 u - 10 u = 90
6 u = 90

1 u = 90 ÷ 6 = 15

Number of blocks that Vaidev had
= 4 u
= 4 x 15
= 60

Answer(s): 60