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 most appropriate option
A) 14 ½ days
B) 16 ½ days
C) 22 ½ days
D) 11 ½ days
E) 19 ½ days
22 ½ days   22 ½ days   1/18 + 1/30 = 8/90 = 4/45   45/4 = 11 ¼ *2 = 22 ½ days
<result>C</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?