Bricklayers

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?

Result

t =  2.143

Solution:


1 = 1/3 + (1/3+1/4)*(t-1)

7t = 15

t = 157 ≈ 2.142857

Calculated by our simple equation calculator.



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