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, w
hich expression would be used to represent the amount of work done by person 1. 21,1/21,x/21,21x
1 answer:
Answer:
1/21.
Step-by-step explanation:
To solve the problem 'How long would they take to do the job working together?' you would work in fractions of the job done / minute:
1/21 + 1/28 = 1/x.
So for person 1 the expression is 1/21.
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