Owen and Flynn had $165 and $145 respectively. Each of them bought a shirt and a jacket at the same price. The cost of the shirt was 4 times as much as the jacket. In the end, Owen had 5 times as much money as Flynn. What was the difference between the cost of the jacket and the shirt?

	Owen	Flynn	Difference
Before	$165	$145	$20
Change	- 5 p	- 5 p
After	5 u	1 u	4 u

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

5 u - 1 u = 165 - 145
4 u = 20

1 u = 20 ÷ 4 = 5

Cost of 1 shirt = 4 p
Cost of 1 jacket = 1 p

Total cost of 1 shirt and 1 jacket
= 4 p + 1 p
= 5 p

5 p = 145 - 5
5 p = 140

1 p = 140 ÷ 5 = 28

Difference in the cost between the shirt and the jacket
= 4 p - 1 p
= 3 p
= 3 x 28
= $84

Answer(s): $84