A takes two times as long as B and C together take to do a job. If all the three working together and complete the job in 24 days then find in how many days A will complete the same job ? (1) 60 days (2) 70 days (3) 72 days (4) 75 days (5) 78 days

• 2a=b+c;
  20days of a work= 10days of b&c work
  2xdays of work by a= xdays of done by b&c
  
  1/2x+1/x=1/24=>x=72
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