Question: A tennis player won 20% of the games he played. Find the total number of games played by him if he won 10 games.
A ) 50
B ) 52
C ) 47
D ) 49
Steps to derive
1 Let n be the total number of games he played.
[Write proportion.]
2 20100 = 10n
[Write the cross product.]
3 n x 20 = 10 x 100
[Divide both side by 20.]
4 n = (10x100)20
[Simplify.]
5 n = 50
6 Total number of games that he played = 50.
Hence the right answer is Option A
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