Luis and Mark had $170 and $126 respectively. Each of them bought a jacket and a skirt at the same price. The cost of the jacket was 4 times as much as the skirt. In the end, Luis had 5 times as much money as Mark. What was the difference between the cost of the skirt and the jacket?

	Luis	Mark	Difference
Before	$170	$126	$44
Change	- 5 p	- 5 p
After	5 u	1 u	4 u

Since Luis and Mark 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 = 170 - 126
4 u = 44

1 u = 44 ÷ 4 = 11

Cost of 1 jacket = 4 p
Cost of 1 skirt = 1 p

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

5 p = 126 - 11
5 p = 115

1 p = 115 ÷ 5 = 23

Difference in the cost between the jacket and the skirt
= 4 p - 1 p
= 3 p
= 3 x 23
= $69

Answer(s): $69