Carol ate 2/5 of the cake, leaving 3/5 of the cake for others ( ! ) Note that 2/5 = 10/25, and that 3/5 = 15/25.
dima at 3/5 of this 3/5, or 9/25 of the cake.
Subtract 9/25 from 10/25: The difference is 1/25.
Carol ate a share that was 1/25 larger than Dima's share.
