SOLUTION: one painter can paint 2 rooms in 90 minutes. if there are 50 rooms how many painters are needed to paint all rooms in 7.5 hours.

Question 358183: one painter can paint 2 rooms in 90 minutes. if there are 50 rooms how many painters are needed to paint all rooms in 7.5 hours.
Answer by Edwin McCravy(20056) (Show Source): You can put this solution on YOUR website!
one painter can paint 2 rooms in 90 minutes. if there are 50 rooms how many
painters are needed to paint all rooms in 7.5 hours.

1 painter's rate = rooms/hour

n painters' combined rate = n  rooms/hour

rooms = rate * time

   50 = n * 7.5

Multiply through by 3

 150 = 4n*7.5

 150 = 30n

   5 = n

It would take 5 painters.

Edwin

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