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OpenStudy (anonymous):
Person 1 can do a certain job in twenty-one minutes, and person 2 can do the same job in twenty-eight minutes. When completing the job together, which expression would be used to represent the amount of work done by person 1? A) 21 B) 1/21 C) x/21 D) 21x Is C the correct answer??
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OpenStudy (anonymous):
yes!
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