John goes to the store to buy Slurpees and gives them $20.  Slurpees cost $2 each and he got $8 in change.  How many Slurpees did he buy?
He spent 20-8=$<T>subtract(20, 8)=12 on Slurpees
So he got 12/2=<T>divide(12, 2)=6.0 Slurpees
