Hannah does push-ups in sets of three she did 10 sets of push-ups today then her coach asked her to do 15 more push-ups

How many push-ups did Hannah do today

She did 45 push-ups.

Since each set is 3 push-ups and she did ten, you would multiple 10x3 which equals 30. The coach asks her to do 15 more which results in 45 push-ups.

she did 15 sets of pushups or 45 pushups