5 persons working eight hours daily can complete a wall in 10 days. When they have Worked for 4 days, 5 more persons are brought to work. The wall can now be completed in?	Choose the correct choice from the following.
A) one more day  B) two more days  C) three more days  D) four more days  E) five more days
Let D be the number of required days   Using the chain rule,   M1 x T1 = M2 x T2 + M3 x T3   5 x 8 x 10 = (4 x 5 x 8) + (10 x 8 x D)   D = 3.   Hence, the wall will be completed in 3 more days.   ANSWER:three more days
<result>C</result>
5 persons working eight hours daily can complete a wall in 10 days. When they have Worked for 4 days, 5 more persons are brought to work. The wall can now be completed in?