A can do work in 9 days, B can do work in 18 days. In how many days they will complete the work together.	Choose the correct choice from the following
A) 8 days	B) 7 days	C) 6 days	D) 5 days	E) 4 days
Bigger no=18, Ratio=9:18=1:2   No of days = 18/(1 + 2)= 
<gadget id="calculator">18/(1 + 2)</gadget>
<output>6</output>
6 days   ANSWER:6 days
<result>C</result>
A can do work in 9 days, B can do work in 18 days. In how many days they will complete the work together.