Question 338595: Sarah paints a room of 400 square feet in 3 hours. How long sea it take her to paint a room of 720 square feet? Answer by nerdybill(7384) (Show Source):
You can put this solution on YOUR website! Sarah paints a room of 400 square feet in 3 hours. How long sea it take her to paint a room of 720 square feet?
.
Sarah's rate is:
3 hours per 400 sq ft
3/400
.
So, time for a 720 sq ft room:
720(3/400)
72(3/40)
216/40
5.4 hours
or
5 hours and 24 minutes
