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Average score of the player (sum of scores in all the games / no. of games) is given. How Can we find the minimum number of games the player should have played to achieve that average. scores are non negative numbers. eg. Average score is :- 30.25 minimum number of games :- 4

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you might consider writing the average as a fraction. – Alexander Nov 4 '12 at 10:21

Write the average score $x$ as a reduced fraction $x=\frac{p}q$. This means that $p$ and $q$ are integers, that $q$ is positive and that $q$ is minimal (or, equivalently, that $p$ and $q$ have no nontrivial common factor). Then the player can have played any multiple of $q$ games hence the minimum number of games the player should have played is $q$.

When $x=-30.25$, note that $-30.25=-\frac{121}{4}$ and $-121$ and $4$ have no common factors except $+1$ and $-1$, hence the minimum number of games is indeed $4$.

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It is possible that what OP doesn't know is how to write a given $x$ as a fraction. – Gerry Myerson Nov 4 '12 at 12:03
@GerryMyerson True. – Did Nov 4 '12 at 12:44

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