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
the lcm of 21,28 = 84
lets assume amount of money to be 84 units
wage of A per day = $$\frac{84}{21}$$ = 4 units
wage of B per day = $$\frac{84}{28}$$ = 3 units
wage per day of A+B = 4+3 = 7 units
total days sufficient are = $$\frac{84}{7}$$ = 12 days
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