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1. Rate of Work Problems by D. Fisher
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3. Marge can clean the house in 3 hrs. Lisa can clean it in 5 hrs. How long will it take them to clean the house if they both work together?
4. Use Unit Rates Marge can clean the house in 3 hrs., so she does 1 / 3 of the house per hour.
5. Use Unit Rates Lisa can clean the house in 5 hrs., so she does 1 / 5 of the house per hour.