A and B can do a work in 15days, B and C in 30days, C and A in 45days. If A,B and C work together , they will complete the work in?
Choices.
A) 10days  B) 16days  C) 20days  D) 25days  E) 22days
A+16days 1day work = 1/15   16days+C 1day work = 1/30   C+A 1day work  +  1= 
<gadget id="calculator"> +  1</gadget>
<output>1</output>
1/30   C+A 1day work = 1/45   Adding we get 2(A+16days+C)  +  1= 
<gadget id="calculator"> +  1</gadget>
<output>1</output>
1/45   Adding we get 2(A+16days+C)= 1/15 + 1/30 + 1/45 = 11/90   A+16days+C 1 day work = 11/180   A,16days,C can finish the work in 180/11 days = 16days approximately   Answer is 16days
<result>B</result>
A and B can do a work in 15days, B and C in 30days, C and A in 45days. If A,B and C work together , they will complete the work in?