If 4 persons can do 4 times of a particular work in 4 days, then, 7 persons can do 7 times of that work in? Choose the correct choice
A) 2 days
B) 3 days
C) 5 days
D) 4 days
E) 9 days
That is, 1 person can do one time of the work in 4 days.   Therefore, 7 persons can do 7 times work in the same 4 days itself.   4 days)
<result>D</result>
If 4 persons can do 4 times of a particular work in 4 days, then, 7 persons can do 7 times of that work in?