A can do a job in 20 days and B can do it in 30 days. A and B working together will finish twice the amount of work in days?  Options.
A) 22 1/6 B) 24 C) 22 1/0 D) 22 1/9 E) 22 1/1
1/20 + 1/30 = 5/60 = 1/12   12 = 12 *2= 
<gadget id="calculator">12 *2</gadget>
<output>24</output>
24 days   Answer: 24
<result>B</result>
A can do a job in 20 days and B can do it in 30 days. A and B working together will finish twice the amount of work in days?