A baker needs 8 1/2 cups of flour for a sheet cake recipe. He has 4 2/3 cups of flour in a canister and buys 5 1/4 cups more.

How much flour does he have left after he makes the sheet cake?

Enter your answer as a mixed number in simplest form.
I dont know if i asked this question already but, I cant find it, but i need help now!