A,B,C can complete a piece of work in 18,6,12 days. Working together, they complete the same work in how many days?  Choose the correct choice
A) 2 B) 4/5 C) 7/9 D) 36/11 E) 24/7
A+B+C 1day work = 1/18 + 1/6 + 1/12 + +  1= 
<gadget id="calculator">+ +  1</gadget>
<output>1</output>
1/18 + 1/6 + 1/12= 11/36   A,B,C together will complete the job in 36/11 days   Answer is 36/11
<result>D</result>
A,B,C can complete a piece of work in 18,6,12 days. Working together, they complete the same work in how many days?