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F.1 Maths 不明白，想要詳細橫式作參考
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發問:
York has $72. Sally has $12. In order to let Sally have 3 times the amount of York, how much should York give Sally? (不明白，想要詳細橫式作參考)
最佳解答:
let x be the money that york should give sally 12+x = 3(72-x) 12+x = 216-3x 4x = 214 x = 53.5 york should give $53.5 to sally
其他解答:
是不是這樣？ let x be the money that york should give sally 12+x = 3(72-x) 12+x = 216-3x x+3x=216-12 4x = 204 x = 51 york should give $51 to sally
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