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

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mreijepatmat mreijepatmat · Answer 1 · 2017-07-25T22:00:13+02:00

The amount of work (or the rate) done by the first person is 1/21
r = 1/21

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slicergiza slicergiza · Answer 2 · 2019-06-25T09:35:47+02:00

Answer:

[tex]\frac{1}{21}[/tex] would be used to represent the amount of work done by person 1.

Step-by-step explanation:

When someone does a work in x time,

Then, the work done by the person in one day = [tex]\frac{1}{x}[/tex]

Given,

Time taken by person 1 = 21 minutes

Thus, by the above statement,

The one day work of person 1 = [tex]\frac{1}{21}[/tex]

Hence, [tex]\frac{1}{21}[/tex] would be used to represent the amount of work done by person 1.

Second option is correct.