Mathematics, 30.11.2020 20:10 ljwatts25
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Lea and Marie are washing all the windows in their house. It would take Lea 80 minutes to wash the windows by herself, and it would take Marie 60 minutes to wash them by herself. Lea creates a table so she can find out how long it will take to wash the windows if they work together. What is the missing value in the table that represents the rate for Marie?
A table showing Rate in part per minute, Time in minutes, and Part of Windows Washed. The first row shows Lea, and has StartFraction 1 Over 80 EndFraction, t, and StartFraction 1 Over 80 EndFraction t. The second row shows Marie, question mark, t, and StartFraction 1 Over 60 EndFraction t.
StartFraction 1 Over 60 EndFraction t
60
StartFraction 1 Over 60 EndFraction tt
60t
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Lea and Marie are washing all the windows in their house. It would take Lea 80...
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