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Answer :
To find Marie's rate, subtract Lea's rate from the combined rate of both. Simplify the expression to find the missing value in the table.
The rate for Marie can be found by determining how much work Lea does in a given amount of time and subtracting it from the total work. Since Lea can wash all the windows in 80 minutes, her rate is 1/80 of the work per minute. To find Marie's rate, we subtract Lea's rate from the combined rate of Lea and Marie, which is 1/80 + 1/60. Simplifying this expression gives us the missing value in the table, which represents Marie's rate.
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