Construction 7709

Two construction companies are working on the landscaping. The first would do the whole job in 12 days, the second in 20 days. How long will they work together if the first start working when the second has already worked 4 days?

Correct answer:

t =  6

Step-by-step explanation:

t/12 + t/20 + 4/20 = 1

8t = 48

t = 48/8 = 6

t = 6

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