Jean paid a total of $108 for a cardigan, a pair of socks and a pair of sport shoes. She spent ²₉ of her money on the pair of socks. The pair of sport shoes cost 3 times as much as the cardigan. How much more did she pay for the pair of sport shoes than the cardigan?
Amount that Jean paid for the pair of socks
= ²₉ x 108 
= $24

Amount that Jean left after buying the socks
= 108 - 24
= $84

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

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

4 u = 84

1 u = 84 ÷ 4 = 21

Amount that Jean paid more for the pair of sport shoes than the cardigan
= 3 u - 1 u
= 2 u
= 2 x 21
= $42

Answer(s): $42