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 = <<3*5=15>>15 envelopes to her friends.
Cindy has 37 envelopes - 15 envelopes = <<37-15=22>>22 envelopes left.
#### 22