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lana66690
[7]
3 years ago
5
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 t
he job together, which expression would be used to represent the amount of work done by person 1?
Mathematics
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1
answer:
schepotkina
[342]
3 years ago
8
0
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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