if you draw a tape diagram and split it into thirds one third is Shally' s and 2 thirds is Katherine's since 3 units equals 288 1 unit equals 288 divided by 3 = 96 per unit since Shally has one third each third equals 96 so Shally started with $ 96
OR
divide 288 with 3 thirds like that so you can still keep your unit the same to get 1 thirds helping of $ 96 which Shally only had one third that equals $ 96 so Shally started with $ 96