Bryan and Jeremy had $104 and $83 respectively. Each of them bought a sweater and a skirt at the same price. The cost of the sweater was 3 times as much as the skirt. In the end, Bryan had 4 times as much money as Jeremy. What was the difference between the cost of the skirt and the sweater?

	Bryan	Jeremy	Difference
Before	$104	$83	$21
Change	- 4 p	- 4 p
After	4 u	1 u	3 u

Since Bryan and Jeremy 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 = 104 - 83
3 u = 21

1 u = 21 ÷ 3 = 7

Cost of 1 sweater = 3 p
Cost of 1 skirt = 1 p

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

4 p = 83 - 7
4 p = 76

1 p = 76 ÷ 4 = 19

Difference in the cost between the sweater and the skirt
= 3 p - 1 p
= 2 p
= 2 x 19
= $38

Answer(s): $38