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The dynamics of crowd behaviour are hard to study because usually people are not reliable witness of their own behaviour. Now consider 4 people standing in the queue of a supermarket. You want to predict their behaviour based on their age group. You get to know fro the supermarket records that their average age 3 years ago was 48 years. After a while, another person joins the queue and the present average of all the 5 is 46 years. The present age of the last person in the queue is:

Ans: 26 years

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TCS Other Question
A sheet of paper has statements numbered from 1 to 20. For all values of n from 1 to 20. Statement n says 'At least n of the statements on this sheet are false.' Which statements are true and which are false?
(a) The even numbered statements are true and the odd numbered are false.
(b) The odd numbered statements are true and the even numbered are false.
(c) The first 6 statements are true and the last 6 are false.
(d) The first 13 statements are false and the last 13 are false. There was a grandmother in a village who had a grandchild. Upon asking her grandchild's age she
told dat she is as older as many days old as her daughter's age in weeks and as many days as her own age in
years. The sum of the three is 130. then how old is the child?