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In the Act (Posted on 2002-11-25) Difficulty: 2 of 5
A mother is 21 years older than her son, and in 6 years time the son will be one fifth of her age.

Where is the father?

See The Solution Submitted by Cheradenine    
Rating: 3.7500 (12 votes)

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Solution Puzzle Resolution | Comment 14 of 15 |

Since by the problem, the word 'son' is specifically mentioned, it follows that we are talking about the present.

Let the respective ages of the mother and son be (s+ 252) months and s months.

Then, by the problem,

s+324 = 5(s+ 72)
or, 4s = -36
or, s = -9

Accordingly, the "present" corresponds to the period when it will be another 9 months before the "son" is born. This is a contradiction.

Consequently, the father is living "in the past".

Edited on March 7, 2008, 3:04 pm
  Posted by K Sengupta on 2007-11-17 05:08:55

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