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Peter has$72 and Mary has $ 12. How much money must Peter give to Mary so that Mary will have 3 times as much as Peter? [[用方程]] 最快就會系''最佳回答''

最佳解答:

Let Peter give the money to Mary is m. 12-m=3(72+m) 12-m=216+3m 204=4m m=51 Peter must give $51 to Mary, so that Mary will have 3 times as much as Peter.

其他解答:

Peter should give Mary $51|||||let x be the value that peter give to mary 3(72-x) = 12+x 216-3x=12+x 4x=204 x=51 thus,peter must give $51 to mary.|||||let money peter give mary is "x" 72-x = 3 ( 12+x) 72-x = 36+3x 72-36=4x x = 9|||||代peter應有既錢為x : 3x+x=72+12 4x=84 x=21 peter應給mary 72-21 =51

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