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A is 60% more efficient than B. If A takes 9 days less than B to do a certain piece of work, then find the number of days it would take them to complete the same work, if both work together.

 
6 8 13 days
8 4 13 days
9 days
9 3 13 days
None of these

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9

9days

How number of days is calculated of a and b

How number of days is calculated of a and b