Answer :
Katie: 7/8
Brother: 3/8
Then you have to subtract Katie's with her brother's.
7/8 - 3/8 = 4/8
Can be simplified to 1/2
Brother: 3/8
Then you have to subtract Katie's with her brother's.
7/8 - 3/8 = 4/8
Can be simplified to 1/2