self Maths Puzzle

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?

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self Other Question

Q. What is the next number of the following sequence
6,9,18,6,36,3,54,....
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?