Question : A, B, and C together can finish a piece of work in 20 days. A alone can finish the work in 40 days. What part of the work B and C together can finish in a day?
Option 1: $\frac{1}{5}$
Option 2: $\frac{1}{20}$
Option 3: $\frac{1}{10}$
Option 4: $\frac{1}{40}$
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Correct Answer: $\frac{1}{40}$
Solution :
A, B, and C per day work = $\frac{1}{20}$
A's working rate per day = $\frac{1}{40}$
The work rate of B and C together
= $\frac{1}{20} - \frac{1}{40}$
= $\frac{1}{40}$
Hence, the correct answer is $\frac{1}{40}$.
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