3gointer77 3gointer77

01-03-2017
Mathematics

contestada

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?

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Аноним Аноним

07-03-2017

I hope this helps you

1/21+1/28=1/t

4/84+3/84=1/t

5/84=1/t

t=84/5

84/5 1

21 ?

?.84/5=1.21

?=5/4

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