George and Ken had $140 and $60 respectively. Each of them bought a cardigan and a jacket at the same price. The cost of the cardigan was 3 times as much as the jacket. In the end, George had 5 times as much money as Ken. What was the difference between the cost of the jacket and the cardigan?

	George	Ken	Difference
Before	$140	$60	$80
Change	- 4 p	- 4 p
After	5 u	1 u	4 u

Since George and Ken 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 = 140 - 60
4 u = 80

1 u = 80 ÷ 4 = 20

Cost of 1 cardigan = 3 p
Cost of 1 jacket = 1 p

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

4 p = 60 - 20
4 p = 40

1 p = 40 ÷ 4 = 10

Difference in the cost between the cardigan and the jacket
= 3 p - 1 p
= 2 p
= 2 x 10
= $20

Answer(s): $20