Gillian paid a total of $144 for a skirt, a pair of socks and a pair of sneakers. She spent ⁴₉ of her money on the pair of socks. The pair of sneakers cost 9 times as much as the skirt. How much more did she pay for the pair of sneakers than the skirt?
Amount that Gillian paid for the pair of socks
= ⁴₉ x 144 
= $64

Amount that Gillian left after buying the socks
= 144 - 64
= $80

Amount that Gillian paid for the skirt = 1 u
Amount that Gillian paid for the sneakers = 9 u

Total amount spent on the skirt and the pair of sneakers
= 1 u + 9 u
= 10 u

10 u = 80

1 u = 80 ÷ 10 = 8

Amount that Gillian paid more for the pair of sneakers than the skirt
= 9 u - 1 u
= 8 u
= 8 x 8
= $64

Answer(s): $64