Question

9 cans of paint are needed to

paint 4 rooms. Exactly how
many cans of paint are needed to
paint 10 rooms? How many cans
of paint should be purchased?
Exact:
Purchased:

Answer 1

Explanation:

Write and solve an equation of ratios:

9 4

----- = -----

x 10

Then 4x = 90, and x = 22.5

It will take exactly 22.5 cans of paint to cover 10 rooms. The painter must buy 23 cans.