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 :

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 :
1). $12\frac{1}{4}$ days
2). 14 days
3). $24\frac{1}{2}$ days
4). 12 days

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