Ethan buys a windbreaker, a jacket and a shirt. The average cost of these items is $32. The cost of the shirt is four times the total cost of the windbreaker and the jacket. If the windbreaker costs $18, find the difference in cost between the jacket and the shirt.
Total cost of the 3 items
= 3 x 32
= $96

Total cost of the windbreaker and the jacket = 1 u
Cost of the shirt = 4 u

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

5 u = 96 

1 u = 96 ÷ 5 = 19.20

Total cost of the windbreaker and the jacket = $19.20

Cost of the jacket 
= 19.20 - 18
= $1.20

Cost of the shirt
= 4 u
= 4 x 19.20
= $76.80

Difference in cost between the jacket and the shirt
= 76.80 - 1.20
= $75.60

Answer(s): $75.60