The total cost of 6 windbreakers and 6 skirts was $402. Tina bought 8 such windbreakers, 6 such skirts and a cardigan for $506. If the total cost of a blouse and a windbreaker was $64, find the difference in cost between the windbreaker and the blouse.
Let 1 W be 1 windbreaker.
Let 1 S be 1 skirt.
Let 1 B be 1 blouse.

6 W + 6 S = 402 --- (1)

1 W + 1 S = 402 ÷ 6
1 W + 1 S = 67 --- (2)

1 W + 1 B = 64 --- (3)

8 W + 6 S + 1 B = 506 --- (4)

(4) - (1)
(8 W + 6 S + 1 B) - (6 W + 6 S) = 506 - 402 
8 W - 6 W + 6 S - 6 S + 1 B = 104

2 W + 1 B = 104 --- (5)

(5) - (3)
(2 W + 1 B) - (1 W + 1 B) = 104 - 64
2 W - 1 W + 1 B - 1 B = 40
2 W - 1 W = 40

1 W = 40

From (3)
1 W + 1 B = 64
40 + 1 B = 64

1 B = 64 - 40 = 24

Difference in the cost between the windbreaker and the blouse
= 1 W - 1 B
= 40 - 24
= $16

Answer(s): $16