Opal sold $680 worth of sweaters and blouses. She earned $328 less on the blouses than the sweaters. Each blouse is sold for $4 more than each sweater. The number of blouses sold was ²₇ of the number of sweaters sold.

1. How much did Opal earn from the sales of the sweaters?
2. How many sweaters were sold?

(a)
Amount that Opal earned from the sales of the sweaters
= (680 + 328) ÷ 2
= 1008 ÷ 2
= $504 

(b)
Amount that Opal earned from the sales of the blouses
= 504 - 328
= $176

Number of sets of blouses sold = 2  
Number of sets of sweaters sold = 7

Cost of 1 set of blouses sold
= 176 ÷ 2
= $88

Cost of 1 set of sweaters sold
= 504 ÷ 7
= $72

Amount that 1 set of blouses was more than 1 set of sweaters 
= 88 - 72
= $16

Number of items in 1 set
= 16 ÷ 4
= 4

Number of sweaters sold
= 7 x 4
= 28

Answer(s): (a) $504 ; (b) 28