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X can do a piece of work in 15 days. If he is joined by Y, who is 50% more efficient, in what time will X and Y together finish the work?

 
10 days
6 days
18 days
Data insufficient
None of these

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12 5

X:Y=150:100 =3:2 Y can do a piece of work in y days 15:y=3:2 y=10 Y can do a piece of work in 10 days X and Y together= 1/15 1/10 =1/6 6days