If 10 men or 18 boys can complete a work in 15 days, then in how many days, 25 men and 15 boys

If 10 men or 18 boys can complete a work in 15 days, then in how many days, 25 men and 15 boys can complete the double of that work?
(a) 9/2
(b) 9
(c) 36
(d) 18

Anurag Mishra Professor Asked on 8th March 2016 in Maths.
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    Answer: (a) 9/2 

    Anurag Mishra Professor Answered on 9th March 2016.
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