Question

Twenty cars go past your house during a 5-minute period. At that rate, how many cars will go past your house during a 15-minute period?

Answer 1

60

Explanation:

because there is (3) 5's in 15, and there are 20 cars going in 5 min. So that means every 5 min you are adding 20 cars, so by the time you get to 15 that will have got to 60. (20=5min) + (20=5min) + (20=5min) = 60 cars in 15 min