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: 12 days
Explanation:
A's 1 day's work = 1/21
B's day's work = 1/28
∴ Same money is sufficient to pay the wages of both for
= 1 / [(1/21) + (1/28)] = (21 x 28) / (21 + 28)
= (21 x 28) / 49
= 3 x 4 = 12 days
