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发表于 2008-7-17 18:22:37
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Long time ago, a rancher spent $100.00 and bought 100 animals. There were 3 kind of animals he bought: each Bull cost him $10.00, each Cow cost him $5.00 and each Calf cost him $0.50. How many he bought for each kind of animal?
Hint: Write up 2 equations 方程式。
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