Glen had $320 and Jeremy had $134 at first. Each of them bought an identical blouse and an identical jumpsuit from the same shop. The jumpsuit cost 3 times as much as the blouse. In the end, Glen had 4 times as much money as Jeremy. What was the cost of the blouse?

	Glen	Jeremy	Difference
Before	$320	$134	$186
Change	- 1 blouse - 1 jumpsuit	- 1 blouse - 1 jumpsuit
After	4 u	1 u	3 u

Since Glen and Jeremy bought the same items, the difference  in their amounts remains the same.

Difference in the amounts that they had
= 4 u - 1 u
= 3 u

3 u = 320 - 134
3 u = 186

1 u = 186 ÷ 3 = 62

Amount that Jeremy had in the end
= 1 u
= $62

Cost of 1 blouse and 1 jumpsuit
= 134 - 1 u
= 134 - 62
= $72

The jumpsuit cost 3 times as much as the blouse.

Cost of 1 blouse = 1 p
Cost of 1 jumpsuit = 3 p

Total cost of 1 blouse and 1 jumpsuit
= 1 p + 3 p
= 4 p

4 p = 72

1 p = 72 ÷ 4 = 18

Cost of the blouse
= 1 p
= $18

Answer(s): $18