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in a competition, seven points were awarded for every game won and 3 points deducted for lost. Adhiambo attempted 20 games and was awarded 80 points, how many games were won?

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W + L = 20 ... 3 W + 3 L = 60

7 W - 3 L = 80

adding equations (to eliminate L) ... 10 W = 140

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