self Maths Puzzle

Q. If 38 men, working 6 hours a day can do a job in 12 days, find the number of days in which 57 men, working 8 hours a day, can do twice that piece of work,supposing that 2 men of the first set do as much work in one hour ad 3 men of other set do in (3/2) hours?

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self Other Question

Q. M men agreed to purchase a gift for Rs D. If 3 men dropout, how much more will each have to contribute towards the purchase of gift?
Q. Shyam picks up a card at random from a set of cards numbered from 101 to 250. if the number on the card that he picks up is a multiple of 9, he wins rs 20, if it is a multiple of 11, he wins Rs 50 and if it is both a multiple of 9 and 11, he wins Rs 100. In the long run, what is the amount Shyam will gain on an average, if he has to pay Rs 3 as a participation fee for each draw?