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Mathematics
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? 21 1/21 x/21 21x

OpenStudy (radar):

Person 1, can do 1/21 of the job in one minute. This is pointed out in the solution of the problem posted directly above this one.

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