<human>:  Archibald and his brother are playing tennis against each other. Archibald has won 12 games and his brother has won 18. What percentage of games has Archibald won?
<bot>: How many games have they played? ** They have played 30 total games because 12 + 18 = <<12+18=30>>30
What percentage of games has Archibald won? ** The proportion won by Archibald is .4 because 12 / 30 = <<12/30=.4>>.4
What percentage of games has Archibald won? ** The percentage he has won in 40% because .4 x 100% = 40%
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