Abi paid a total of $140 for a sweater, a pair of socks and a pair of sport shoes. She spent ⁶₇ of her money on the pair of socks. The pair of sport shoes cost 4 times as much as the sweater. How much more did she pay for the pair of sport shoes than the sweater?
Amount that Abi paid for the pair of socks
= ⁶₇ x 140 
= $120

Amount that Abi left after buying the socks
= 140 - 120
= $20

Amount that Abi paid for the sweater = 1 u
Amount that Abi paid for the sport shoes = 4 u

Total amount spent on the sweater and the pair of sport shoes
= 1 u + 4 u
= 5 u

5 u = 20

1 u = 20 ÷ 5 = 4

Amount that Abi paid more for the pair of sport shoes than the sweater
= 4 u - 1 u
= 3 u
= 3 x 4
= $12

Answer(s): $12