3 room can be made by 34 men who work 12 hrs. a day , in 16 days .how many hours will 22 man have to work every day if 4 room to be make and the work has to be complete in 26 days.

According to the question :

Let x is hr. / day's

work	men	hr./day's	day's
3	34	12	16
4	22	x	26

3 * 22 * x * 26 = (4 * 34 * 12 * 16)

x = (4 * 34 * 12 * 16) / (3 * 22 * 26)

x = 26112 / 1716

= 2176 / 143

= 15³¹/₁₄₃

Men have to work every day 15³¹/₁₄₃ hrs.