20/4 = 5
He takes 5 minutes to complete each problem.
Can you take it from there?
Ben can complete 4 math problems in 20 minutes. If he continues working at the same rate, how long will it take Ben to complete 17 math problems?
2 answers
20/4=5
5*17=85
Therefore it will take him 85 min to complete 17 questions.
5*17=85
Therefore it will take him 85 min to complete 17 questions.