Albert and Justin had $91 and $77 respectively. Each of them bought a hoodie and a blouse at the same price. The cost of the hoodie was 4 times as much as the blouse. In the end, Albert had 3 times as much money as Justin. What was the difference between the cost of the blouse and the hoodie?

	Albert	Justin	Difference
Before	$91	$77	$14
Change	- 5 p	- 5 p
After	3 u	1 u	2 u

Since Albert and Justin 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 = 91 - 77
2 u = 14

1 u = 14 ÷ 2 = 7

Cost of 1 hoodie = 4 p
Cost of 1 blouse = 1 p

Total cost of 1 hoodie and 1 blouse
= 4 p + 1 p
= 5 p

5 p = 77 - 7
5 p = 70

1 p = 70 ÷ 5 = 14

Difference in the cost between the hoodie and the blouse
= 4 p - 1 p
= 3 p
= 3 x 14
= $42

Answer(s): $42