Question

David paints 3 rooms in 7 hours. At the same pace, how long would it take him to paint 15 rooms?

Answer 1

`35` hours

Explanation:

Set up a ratio

Let `x` be the number of hours needed

`x /15= 7/3` Multiply both sides by 15

`15 xx x/15 = 15 xx 7/3` This gives

`x = 105/3` dividing gives

`x = 35` hours