Cole and Warren had $135 and $99 respectively. Each of them bought a blouse and a skirt at the same price. The cost of the blouse was 4 times as much as the skirt. In the end, Cole had 5 times as much money as Warren. What was the difference between the cost of the skirt and the blouse?

	Cole	Warren	Difference
Before	$135	$99	$36
Change	- 5 p	- 5 p
After	5 u	1 u	4 u

Since Cole and Warren bought the same items at the same price, the difference in the amounts they had remains unchanged at first and in the end.

5 u - 1 u = 135 - 99
4 u = 36

1 u = 36 ÷ 4 = 9

Cost of 1 blouse = 4 p
Cost of 1 skirt = 1 p

Total cost of 1 blouse and 1 skirt
= 4 p + 1 p
= 5 p

5 p = 99 - 9
5 p = 90

1 p = 90 ÷ 5 = 18

Difference in the cost between the blouse and the skirt
= 4 p - 1 p
= 3 p
= 3 x 18
= $54

Answer(s): $54