Construction of road

For the construction of the road dam, it is supposed to transport six trucks a total of 18 days. After three days, two more cars were sent to the construction site. How long will it take to carry the material?

Correct result:

t =  14.25 d

Solution:

6•18 = 3•6+(t-3)•(6+2)

8t = 114

t = 57/4 = 14.25

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