Zane and Japheth had $168 and $129 respectively. Each of them bought a blouse and a jacket at the same price. The cost of the blouse was 3 times as much as the jacket. In the end, Zane had 4 times as much money as Japheth. What was the difference between the cost of the jacket and the blouse?

	Zane	Japheth	Difference
Before	$168	$129	$39
Change	- 4 p	- 4 p
After	4 u	1 u	3 u

Since Zane and Japheth 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 = 168 - 129
3 u = 39

1 u = 39 ÷ 3 = 13

Cost of 1 blouse = 3 p
Cost of 1 jacket = 1 p

Total cost of 1 blouse and 1 jacket
= 3 p + 1 p
= 4 p

4 p = 129 - 13
4 p = 116

1 p = 116 ÷ 4 = 29

Difference in the cost between the blouse and the jacket
= 3 p - 1 p
= 2 p
= 2 x 29
= $58

Answer(s): $58