Hi,

75 boys can complete a work in 24 days or twice the work in 48 days: each boy 1/48*75 per day or 3 boys 1/48*25 per day

how many men need to complete twice the work in 20 days (2mens work=3boys)

 2 men = 1/48*25  or 1 man 1/48*50 per day or 20/48*50 in 20 days

   20/48*50 = 1/24*5 = 1/240.  Would take 240 men to complete twice the  work in 20 days 

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