A) \[12\frac{1}{4}\]days
B) 14 days
C) \[24\frac{1}{2}\]days
D) 12 days
Correct Answer: D
Solution :
One day's wages of the both \[=\frac{1}{21}+\frac{1}{28}=\frac{4+3}{84}=\frac{1}{12}\] \[\therefore \] Number of days =12
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