Question

A can do a work in 24 days, B can do the same work in 30 days and C in 40
days. They began the work together, but C left 4 days before completion of
the work. In how many days the work was completed

Answer 1

Answer:

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Step-by-step explanation:

One day's work of A, B and C = (1/24 + 1/30 + 1/40) = 1/10. C leaves 4 days before completion of the work, which means only A and B work during the last 4 days. Work done by A and B together in the last 4 days = 4 (1/24 + 1/30) = 3/10.