Answer the following question, with explanation first.
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?

30
Sasha completes 15 questions / hour * 2 hours = 30 questions.

This means there are still 60 questions – 30 questions = 30 questions left to complete.

.

The final answer: 30