Question

Three persons A, B and C can complete a piece of work alone in 12 days, 15 days and 20 days, respectively.

  • I A and B work together for x days. I
  • I Then only C works for 3 days; after that, 2/5 of the work still remains to be done. II
  • I   If instead only B had worked for 3 days (after A and B worked for x days), 7/20 of the work would have remained. What is the value of x?
A 5 days
B 3 days
C 8 days
D 10 days
E None of these
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