self Maths Puzzle

Suppose that, you are driving a bus with 10 passengers....
at 1st stop 8 people get in and 2 people come got out. then, at 2nd stop 8 people come down and 2 people got in. then, at 3rd stop again 8 people got in and 2 people got down.the bus comes to it last stop and this time all the people come down. the bus relaxes. now find the AGE of the driver.

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self Other Question
plz give me concept over cube related question Three piles of chips--pile I consists one chip, pile II consists of chips, and pile III consists of three chips--are to be used in game played by Anita and Brinda.The game requires:
a)That each player in turn take only one chip or all chips from just one pile.
b)That the player who has to take the last chip loses.
c)That Anita now have her turn.
From which pile should Anita draw in order to win?