Andy and Julian had $144 and $120 respectively. Each of them bought a shirt and a skirt at the same price. The cost of the shirt was 5 times as much as the skirt. In the end, Andy had 3 times as much money as Julian. What was the difference between the cost of the skirt and the shirt?

	Andy	Julian	Difference
Before	$144	$120	$24
Change	- 6 p	- 6 p
After	3 u	1 u	2 u

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

3 u - 1 u = 144 - 120
2 u = 24

1 u = 24 ÷ 2 = 12

Cost of 1 shirt = 5 p
Cost of 1 skirt = 1 p

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

6 p = 120 - 12
6 p = 108

1 p = 108 ÷ 6 = 18

Difference in the cost between the shirt and the skirt
= 5 p - 1 p
= 4 p
= 4 x 18
= $72

Answer(s): $72