A sum of money is sufficient to pay A's wages for 21 days and B's wages for 28 days. The same money is sufficient to pay the wages of both for
Correct Answer: Description for Correct answer:
A's 1 day's work = \( \Large \frac{1}{21} \)
B's 1 day's work = \( \Large \frac{1}{28} \)
Therefore, Same money is sufficient to pay the wages of both for
= \( \Large \frac{1}{\frac{1}{21}+\frac{1}{28}} \)
= \( \Large \frac{21 \times 28}{21+28} = \frac{21 \times 28}{49} = 3 \times 4 \) = 12 days
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