Assistant 39951

The worker performs the repair work in 20 days, and his assistant does the job himself in 60 days. How many days would they work together?

Correct answer:

x =  15 d

Step-by-step explanation:

a=20 d b=60 d  x (1/a+1/b)=1 x (1/20+1/60)=1  4x=60  x=460=15  x=15=15 d



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