Rael buys a sweater, a blouse and a jumpsuit. The average cost of these items is $87. The cost of the jumpsuit is four times the total cost of the sweater and the blouse. If the sweater costs $22, find the difference in cost between the blouse and the jumpsuit.
Total cost of the 3 items
= 3 x 87
= $261

Total cost of the sweater and the blouse = 1 u
Cost of the jumpsuit = 4 u

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

5 u = 261 

1 u = 261 ÷ 5 = 52.20

Total cost of the sweater and the blouse = $52.20

Cost of the blouse 
= 52.20 - 22
= $30.20

Cost of the jumpsuit
= 4 u
= 4 x 52.20
= $208.80

Difference in cost between the blouse and the jumpsuit
= 208.80 - 30.20
= $178.60

Answer(s): $178.60