Sasha can complete 15 questions an hour. If she has 60 questions to complete and she works for 2 hours, how many questions does she still need to complete?
Sasha completes 15 questions/hour * 2 hours = <T>multiply(15, 2)=30 questions.
This means there are still 60 questions – 30 questions = <T>subtract(60, 30)=30 questions left to complete.
