A can do a job in 12 days and B can do it in 20 days. A and B working together will finish twice the amount of work in days?  Choose the correct choice from the following options: A) 22 1/6 B) 22 1/2 C) 22 1/0 D) 15 E) 22 1/1
1/12 + 1/20 = 8/60 = 2/15   15/2 = 15/2 *2= 
<gadget id="calculator">15/2 *2</gadget>
<output>15</output>
15 days   Answer: 15
<result>D</result>
A can do a job in 12 days and B can do it in 20 days. A and B working together will finish twice the amount of work in days?