A can do a job in 18 days and B can do it in 30 days. A and B working together will finish twice the amount of work in ------- days?	Choose the correct choice from the following choices.
A) 21 ½ days B) 22 ½ days C) 23 ½ days D) 12 ½ days E) none of these
1/18 + 1/30 = 8/90 = 4/45   45/4 = 11 ¼ *2 = 22 ½ days   ANSWER:22 ½ days
<result>B</result>
A can do a job in 18 days and B can do it in 30 days. A and B working together will finish twice the amount of work in ------- days?