There is a pile of sweets, among which there are only fruit candy and milk candy. The number of fruit candy is 5/6 of that of milk candy. If toffee eats 12 pieces, then the amount of toffee becomes 80% of fruit candy. How many toffees are there in this pile? So toffee is fruit candy: 6/5. So the original fruit candy is: 12/(6/5-80%)=30. It turns out that toffee is: 30*6/5=36.