Cindy has 37 envelopes. If Cindy gives 3 envelopes to each of her 5 friends, how many envelopes does she have left?
Cindy gave 3 envelopes/friend x 5 friends = <T>multiply(3, 5)=15 envelopes to her friends.
Cindy has 37 envelopes - 15 envelopes = <T>subtract(37, 15)=22 envelopes left.
