You need to convert 1/3 and 4/5 into ?/15...

1/3 = 5/15

4/5 = 12/15

so you need to add .... 12-5 = 7/15 cups !!! Bit tricky to measure 7/15 cups, but its pretty much half a cup =)

1/3 = 5/15

4/5 = 12/15

so you need to add .... 12-5 = 7/15 cups !!! Bit tricky to measure 7/15 cups, but its pretty much half a cup =)