John had $228 and Cody had $116 at first. Each of them bought an identical shirt and an identical vest from the same shop. The vest cost 3 times as much as the shirt. In the end, John had 5 times as much money as Cody. What was the cost of the shirt?

	John	Cody	Difference
Before	$228	$116	$112
Change	- 1 shirt - 1 vest	- 1 shirt - 1 vest
After	5 u	1 u	4 u

Since John and Cody bought the same items, the difference  in their amounts remains the same.

Difference in the amounts that they had
= 5 u - 1 u
= 4 u

4 u = 228 - 116
4 u = 112

1 u = 112 ÷ 4 = 28

Amount that Cody had in the end
= 1 u
= $28

Cost of 1 shirt and 1 vest
= 116 - 1 u
= 116 - 28
= $88

The vest cost 3 times as much as the shirt.

Cost of 1 shirt = 1 p
Cost of 1 vest = 3 p

Total cost of 1 shirt and 1 vest
= 1 p + 3 p
= 4 p

4 p = 88

1 p = 88 ÷ 4 = 22

Cost of the shirt
= 1 p
= $22

Answer(s): $22