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Darts competition, each of the 10 points in a dart, investment is not in Kau 5 points. Darts 140 in

Flat faint people2010-02-17 18:10:33 +0000 #1

wuxuetianzi2010-02-17 18:22:44 +0000 #2
set to vote in the number of times X, did not vote in the number of times Y, the column equations

X + Y = 20

10x-5y = 140

solve-x = 16 y = 4

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