A,B,C can do a piece of work in 11days, 20days and 55days respectively, working alone. How soon can the work be done if A is assisted by B and C on alternate days?	Pick one: A) 2 B) 4 C) 8 D) 10 E) 12
A+B 1day work = 1/11 + 1/20 +  1= 
<gadget id="calculator">+  1</gadget>
<output>1</output>
1/11 + 1/20= 31/220   A+8 1day work = 1/11 + 1/55 = 6/55   work done in 2 days = 31/220 + 6/55 = 55/220 = 1/4   1/4 work is done by A in 2days   Whole work will be done in  2*4= 
<gadget id="calculator"> 2*4</gadget>
<output>8</output>
8days   Answer is 8
<result>C</result>
A,B,C can do a piece of work in 11days, 20days and 55days respectively, working alone. How soon can the work be done if A is assisted by B and C on alternate days?