Person 1 can do a certain job in 21 minutes, and person 2 can do the same job in 28 minuets. 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

Question

Mathematics

Patricia Villarreal

1 February, 00:09

Person 1 can do a certain job in 21 minutes, and person 2 can do the same job in 28 minuets. 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

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Answers (1)

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Bianca · Answer 1

1/21.

Step-by-step explanation:

To solve the problem 'How long would they take to do the job working together?' you would work in fractions of the job done / minute:

1/21 + 1/28 = 1/x.

So for person 1 the expression is 1/21.