Mathematics, 23.06.2019 05:10 laurabwhiddon

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

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