Question

Mr Corwin gave his students 3 / 4 hour to study for a test. After 1/4 hour, he played a review game for the remaining time. How much time did Mr Corwin spend playing the game?

Answer 1

First, convert this to minutes.  45 minutes for studying.  After 15 minutes, they played a game.  So, 45-15 = 30.  They played the game for 30 minutes.