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25 men in 32 days do 25*32 = 800 man-days of word. If you have 20 men, they would take 800/20 = 40 days.
225 days
1 man would take 80 days to complete the work, so 1 man in 1 day would complete 1/80 of the work. 1 child would take 160 days to complete the work, so 1 child in one day would complete 1/160 of the work. In 1 day, 5 men and 10 children could do 5/80 + 10/160 = 1/16 +1/16 = 1/8 of the work. It would take them 8 days to do the job.
4 hours