The first bricklayer would build a wall in 3 days, the second in 4 days. The first bricklayer worked alone for a day, then the second bricklayer came to his aid and they finished the work together. How long did it take to build the wall?

Correct result:

t =  2.1429


1 = 1/3 + (1/3+1/4)•(t-1)

7t = 15

t = 15/7 ≈ 2.142857

Our simple equation calculator calculates it.

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