self Maths Puzzle

A man wanted to enter an exclusive club but did not know the password that was required. He waited by the door and listened. A club member knocked on the door and the doorman said,"twelve." The member replied, "six" and was let in. Another member came to the door and the doorman said, "six." The member replied, "three"and was also let in. The man thought he had heard enough and walked up and knocked on thedoor. The doorman said, "ten" and the man replied, "five." He was not let in. What should he have replied and why?

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self Other Question

A and B can finish a piece of work in 20 days .B and C in 30 days and C and A in 40 days. In how many days will A alone finish the job
(a) 48
(b) 34 2/7
(c) 44
(d) 48
A man while looking at a photograph said, "Brothers and sisters have I none. That man's father is my father's son."