Troy bakes 2 pans of brownies, cut into 16 pieces per pan.  The guests eat all of 1 pan, and 75% of the 2nd pan.  One tub of ice cream provides 8 scoops.  If all but 4 of the guests eat the brownies ala mode (with 2 scoops of vanilla ice cream), how many tubs of ice cream did the guests eat?
Troy bakes 2 x 16 = <T>multiply(2, 16)=32 brownie pieces.
75% of one pan is 16 x 0.75 = <T>multiply(16, 0.75)=12.0 pieces.
Guests eat 16 + 12 = <T>add(16, 12)=28 pieces.
This many guests eat the brownies ala mode 28 - 4 = <T>subtract(28, 4)=24
This many scoops are eaten by the guests 24 x 2 = <T>multiply(24, 2)=48
The guests eat this many tubs 48 / 8 = <T>divide(48, 8)=6.0 tubs.
