Jean paid a total of $198 for a skirt, a pair of socks and a pair of sport shoes. She spent ⁵₁₁ of her money on the pair of socks. The pair of sport shoes cost 3 times as much as the skirt. How much more did she pay for the pair of sport shoes than the skirt?
Amount that Jean paid for the pair of socks
= ⁵₁₁ x 198 
= $90

Amount that Jean left after buying the socks
= 198 - 90
= $108

Amount that Jean paid for the skirt = 1 u
Amount that Jean paid for the sport shoes = 3 u

Total amount spent on the skirt and the pair of sport shoes
= 1 u + 3 u
= 4 u

4 u = 108

1 u = 108 ÷ 4 = 27

Amount that Jean paid more for the pair of sport shoes than the skirt
= 3 u - 1 u
= 2 u
= 2 x 27
= $54

Answer(s): $54