Man is Twice fast as Woman who is Twice fast as Boy

A man is twice as fast as a woman and a woman is twice as fast as a boy. If all of them i.e., a man, a woman and a boy can finish a work together in 4 days, in how many days will a boy do it alone?

  1. 28 days
  2. 7 days
  3. 21 days
  4. 14 days
Pushpendra Pal Dean Asked on 14th September 2015 in Maths.
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1 Answer(s)

Answer: (1) 28 days

Explanation:-
1 man = 2 women
1 woman = 2 boy
Then, 1 man = 2 x 2 boy = 4 boy
1 man, 1 woman and 1 boy can finish a work together = 4 days
4 boys, 2 boys and 1 boys can finish a work together = 4 days
Then, 7 boys can finish a work together = 4 days

Therefore, 1 boy can finish  a work = 4 x 7 = 28 days

Hence, the answer is (1) 28 days.

Anurag Mishra Professor Answered on 15th September 2015.
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