Question

Andy painted 3 portraits every 6 minutes. At that rate, how long, in minutes, will it take to paint 4 portraits??

Answer 1

A: 3 portraits = 6 minutes

B: 1 portrait = 2 minutes
(divide both sides of A by 3)

C: 4 portraits = 8 minutes
(multiply both sides of B by 4)

Answer 2

It will take Andy 8 minutes to paint 4 portraits. We first need to find out how long it takes him to paint 1 portrait by dividing both sides by 3. That will get us a unit rate of 2 mins per portrait. Then we multiply the number of portraits (4) by 2 which is 8 minutes.