Oliver and Warren had $154 and $97 respectively. Each of them bought a blouse and a cardigan at the same price. The cost of the blouse was 5 times as much as the cardigan. In the end, Oliver had 4 times as much money as Warren. What was the difference between the cost of the cardigan and the blouse?

	Oliver	Warren	Difference
Before	$154	$97	$57
Change	- 6 p	- 6 p
After	4 u	1 u	3 u

Since Oliver and Warren 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 = 154 - 97
3 u = 57

1 u = 57 ÷ 3 = 19

Cost of 1 blouse = 5 p
Cost of 1 cardigan = 1 p

Total cost of 1 blouse and 1 cardigan
= 5 p + 1 p
= 6 p

6 p = 97 - 19
6 p = 78

1 p = 78 ÷ 6 = 13

Difference in the cost between the blouse and the cardigan
= 5 p - 1 p
= 4 p
= 4 x 13
= $52

Answer(s): $52