If 20 persons can do a piece of work in 7 days, then the number of persons required to complete the work in 28 days:

If 40 persons can do a piece of work in 14 days, then the number of persons required to complete the work in 28 days.

If 20 persons can do a piece of work in 7 days then calculate the number of persons required to complete the work in 28 days

If 5 men do a piece of work in 28 days, then the number of persons required to do the same work in 7 days is

30 persons can do a piece of work in 24 days. How many more people are required to complete the work in 20 days?

15 persons can do a piece of work in 12 days. How many more people are required to complete the work in 10 days?

12 persons can do a piece of work in 4 days. How many persons are required to complete 8 times the work in half the time? 144 b. 190 c. 180 d. 192

Some persons can do piece of work in 12 days. Two times the number of such persons will do half of the work in (A) 9 days (B) 6 days (C) 5 days (D) 3 days