Paul and Warren had $178 and $122 respectively. Each of them bought a shirt and a skirt at the same price. The cost of the shirt was 3 times as much as the skirt. In the end, Paul had 5 times as much money as Warren. What was the difference between the cost of the skirt and the shirt?

	Paul	Warren	Difference
Before	$178	$122	$56
Change	- 4 p	- 4 p
After	5 u	1 u	4 u

Since Paul 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 = 178 - 122
4 u = 56

1 u = 56 ÷ 4 = 14

Cost of 1 shirt = 3 p
Cost of 1 skirt = 1 p

Total cost of 1 shirt and 1 skirt
= 3 p + 1 p
= 4 p

4 p = 122 - 14
4 p = 108

1 p = 108 ÷ 4 = 27

Difference in the cost between the shirt and the skirt
= 3 p - 1 p
= 2 p
= 2 x 27
= $54

Answer(s): $54