Flynn buys a windbreaker, a blazer and a blouse. The average cost of these items is $64. The cost of the blouse is four times the total cost of the windbreaker and the blazer. If the windbreaker costs $13, find the difference in cost between the blazer and the blouse.
Total cost of the 3 items
= 3 x 64
= $192

Total cost of the windbreaker and the blazer = 1 u
Cost of the blouse = 4 u

Total cost of the 3 items 
= 1 u + 4 u
= 5 u

5 u = 192 

1 u = 192 ÷ 5 = 38.40

Total cost of the windbreaker and the blazer = $38.40

Cost of the blazer 
= 38.40 - 13
= $25.40

Cost of the blouse
= 4 u
= 4 x 38.40
= $153.60

Difference in cost between the blazer and the blouse
= 153.60 - 25.40
= $128.20

Answer(s): $128.20