A and B can do a piece of work in 12 days and 16 days respectively. Both work for 3 days and then A goes away. Find how long will B take to complete the remaining work? Choose the correct choice from the following answers
A) 4 days  B) 7 days  C) 9 days  D) 8 days  E) 2 days
9 days   3/12 + (3 + x)/16 = 1   x = 9 days
<result>C</result>
A and B can do a piece of work in 12 days and 16 days respectively. Both work for 3 days and then A goes away. Find how long will B take to complete the remaining work?