Donna made a cake to take to a party where the guests ate half the cake. The day after the party, she shared half the leftovers with her brothers. The following day, she ate one piece as a midnight snack. Twice as many pieces as her snack were left. How many pieces was the cake to begin with?
Donna had 2 * 1 = <T>multiply(2, 1)=2 pieces of cake left.
Before her snack, there were 2 + 1 = <T>add(2, 1)=3 pieces left.
Those 3 pieces were half the leftovers, so she had 3 * 2 = <T>multiply(3, 2)=6 pieces before sharing with her brothers.
Those 6 pieces were half the party leftovers, so the cake was 2 * 6 = <T>multiply(6, 2)=12 pieces before the party.
