For every one dozen flowers bought, a customer gets 2 free flowers. If Maria wants to buy 3 dozens flowers, how many pieces of flowers will she have in all?
Maria has 3 x 2 = <T>multiply(3, 2)=6 free flowers from buying 3 dozens flowers.
Since each dozen is equal to 12, then Maria bought 3 x 12 = <T>multiply(3, 12)=36 flowers.
Hence, she has a total of 36 + 6 = <T>add(36, 6)=42 flowers.
