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3 votes
Kathy can clean 12 house in 10 hrs. If she goes at a steady pace. How many hrs. will it take her to clean 27 houses?

User Kynan
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7.8k points

2 Answers

4 votes
12 houses/10 hours=1.2 house per hour
27 houses/1.2 houses per hour=22.5 hours
User Deltheil
by
8.4k points
4 votes
To solve this, set up a proportion with X being our unknown. If she cleans 12 houses in 10 hours, she cleans 27 houses in X hours. It will look like
(12)/(10) = (27)/(x).

Now cross-multiply to get 12x = 27(10) or 12x = 270. Divide by 12 on both sides to isolate x, X = 22.5.

It will take Kathy 22.5 hours to clean 27 houses. Must be some pretty small houses.
User BPeter
by
8.1k points
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