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The rates of working of A and B are in the ratio 3 : 4. The number of days taken by them to finish the work are in the ratio?

3 : 4
9 : 16
4 : 3
None of these

Correct Answer: 4 : 3

Explanation:

Radio of times taken = (1/3) : (1/4) = 4 : 3

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