Question 1059181
Rizwan gives 2/5 of a truffle to his friend; leaving himself with 3/5. He eats 1/5th of this, digesting 1/5th of his 3/5ths, or 3/25ths of the original truffle. He is left with 4/5ths of 3/5ths, or 12/25ths of the original whole truffle. ☺☺☺☺