A and B can do a work in 8days, B and C can do it in 12days; A,B and C together can finish it in 6days. A and C together will do it in?
Choose one:
A) 8days  B) 10days  C) 12days  D) 7days  E) 5days
A+B+C 1day work = 1/6   A+B 1day work + +  1= 
<gadget id="calculator">+ +  1</gadget>
<output>1</output>
1/6   A+B 1day work = 1/8   B+C 1day work  +  1= 
<gadget id="calculator"> +  1</gadget>
<output>1</output>
1/8   B+C 1day work = 1/12   A+C 1day work  +  1= 
<gadget id="calculator"> +  1</gadget>
<output>1</output>
1/12   A+C 1day work= 2*1/6 - 1/8+1/12 = 1/3 - 5/24 = 3/24 = 1/8   A and C together will do the work in 8 days.   8daysnswer is 8days
<result>A</result>
A and B can do a work in 8days, B and C can do it in 12days; A,B and C together can finish it in 6days. A and C together will do it in?