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

Since Person 1 can complete the entire job (100% = 1/1 = 1) in 21 minutes, this person can complete 1/21 of the job per minute. This is Person 1's rate. If x is the amount of time it takes both people together to finish the job, then the amount of work Person 1 does would be (1/21)(x) = x/21.

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kaedalou kaedalou · Answer 2 · 2021-02-05T14:45:26+01:00

kaedalou kaedalou

05-02-2021

Answer:

x/21

Explanation:

I did this assignment.

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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

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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