A certain sum of money is sufficient to pay either A's wage for 20 days or B's wages for 30 days. For how long will it suffice if both A and B work together?
a. 8 b. 6 c. 9 d. 5
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Answer:
12 days
(The answer does not seem to match the options, either options may be wrong or my solution)
Explanation:
Let the total amount be x
Since, x is sufficient to pay wage of A for 20 days
∴ Daily wage of A = x/20
Similarly, daily wage of B = x/30
When they both start working together, the combined daily wage of A and B
Therefore the amount x will last for = days
= 12 days
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