There are two fruits
SO, it will be 1/4*2
= 1/8 of total fruit eaten by Kate
Total fraction fruit eaten by Ben= 2/4*2
= 2/8
So, total fraction of fruit eaten by both Kate and Ben
=1/8+2/8
=1+2/8
=3/8 of the total of both fruit eaten
So, its not 3/4 of their fruit eaten. Instead it is 3/8