Question

Betsy can clean a/b of the house in an hour. How long will it take her to clean the whole house?

Answer 1

`b/a\ hours`

Explanation:

we know that

Betsy can clean a/b of the house in an hour

The whole house (100%) correspond to the number 1

so

using proportion

Find out how long will it take her to clean the whole house

`((a/b))/(1)=(1)/(x) \\ \\x=1/(a/b)\\ \\x=b/a\ hours`