Shiyun sold $2180 worth of skirts and jumpsuits. She earned $900 less on the jumpsuits than the skirts. Each jumpsuit is sold for $10 more than each skirt. The number of jumpsuits sold was ²₇ of the number of skirts sold.

1. How much did Shiyun earn from the sales of the skirts?
2. How many skirts were sold?

(a)
Amount that Shiyun earned from the sales of the skirts
= (2180 + 900) ÷ 2
= 3080 ÷ 2
= $1540 

(b)
Amount that Shiyun earned from the sales of the jumpsuits
= 1540 - 900
= $640

Number of sets of jumpsuits sold = 2  
Number of sets of skirts sold = 7

Cost of 1 set of jumpsuits sold
= 640 ÷ 2
= $320

Cost of 1 set of skirts sold
= 1540 ÷ 7
= $220

Amount that 1 set of jumpsuits was more than 1 set of skirts 
= 320 - 220
= $100

Number of items in 1 set
= 100 ÷ 10
= 10

Number of skirts sold
= 7 x 10
= 70

Answer(s): (a) $1540 ; (b) 70