Question

Jeff can build 7 birdhouses in 5 hours. Use a

proportion to find out how long it would take
him to build 30 birdhouses. (Round answer to
nearest whole number)

Answer 1

21 hours

Explanation:

We can use a ratio to solve

7 houses 30 houses

------------- = --------------

5 hours x hours

Using cross products

7x = 5*30

7x = 150

Divide by 7

7x/7 =150/7

x =21.42857143

Rounding to the nearest whole number

x = 21 hours