Cindy buys a blazer, a dress, a blouse and a sweater. The average cost of these items is $33. The total cost of the blouse and the sweater is ⁵₆ of the total cost of the blazer and the dress. If the blazer costs $16.40 and the sweater costs $16.70, find the difference in cost between the dress and the blouse.
Total cost of the 4 items
= 4 x 33
= $132

Total cost of the blouse and the sweater = 5 u
Total cost of the blazer and the dress = 6 u

Total cost of the 4 items
= 5 u + 6 u
= 11 u

11 u = 132

1 u = 132 ÷ 11 = 12

Total cost of the blouse and the sweater
= 5 u
= 5 x 12
= $60

Cost of the blouse
= 60 - 16.70
= $43.30

Total cost of the blazer and the dress
= 6 u
= 6 x 12
= $72

Cost of the dress
= 72 - 16.40
= $55.60

Difference in cost between the dress and the blouse
= 55.60 - 43.30
= $12.30

Answer(s): $12.30