A can do a job in 12 days and B can do it in 15 days. A and B working together will finish twice the amount of work in days?  Choose the most appropriate option:
A) 22 1/6	B) 22 1/2	C) 22 1/0	D) 22 1/9	E) 13 1/3
1/12 + 1/15 = 9/60 = 3/20   20/3 = 20/3 *2 = 13 1/3 days   Answer: 13 1/3
<result>E</result>
A can do a job in 12 days and B can do it in 15 days. A and B working together will finish twice the amount of work in days?