Oscar and Harry had $110 and $95 respectively. Each of them bought a skirt and a sweater at the same price. The cost of the skirt was 5 times as much as the sweater. In the end, Oscar had 4 times as much money as Harry. What was the difference between the cost of the sweater and the skirt?

	Oscar	Harry	Difference
Before	$110	$95	$15
Change	- 6 p	- 6 p
After	4 u	1 u	3 u

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

4 u - 1 u = 110 - 95
3 u = 15

1 u = 15 ÷ 3 = 5

Cost of 1 skirt = 5 p
Cost of 1 sweater = 1 p

Total cost of 1 skirt and 1 sweater
= 5 p + 1 p
= 6 p

6 p = 95 - 5
6 p = 90

1 p = 90 ÷ 6 = 15

Difference in the cost between the skirt and the sweater
= 5 p - 1 p
= 4 p
= 4 x 15
= $60

Answer(s): $60