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 option:
A) 10 days
B) 17 days
C) 147 days
D) 9 days
E) 1478 days
3/12 + (3 + x)/16 = 1   x = 9 days   Answer: 9 days
<result>D</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?