If 3 persons can do 3 times of a particular work in 3 days, then, 7 persons can do 7 times of that work in?  Choose the correct choice from the following answers.
A) 3 days
B) 4 days
C) 6 days
D) 7 days
E) 8 days
That is, 1 person can do one time of the work in 3 days.   Therefore, 7 persons can do 7 times work in the same 3 days itself   3 days)
<result>A</result>
If 3 persons can do 3 times of a particular work in 3 days, then, 7 persons can do 7 times of that work in?