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来自黄协清的问题

  【after2femalesleaveaparty,therearetwiceasmanymalesasfemales.then9malesleaveandtherearetwiceasmanyfemailsasmales.Thetotlenumberofpropleleftatthepartyafterthe9malesleave.twiceasmany..as到底是谁是谁两倍,】

  after2femalesleaveaparty,therearetwiceasmanymalesasfemales.then9malesleaveandtherearetwiceasmanyfemailsasmales.Thetotlenumberofpropleleftatthepartyafterthe9malesleave.

  twiceasmany..as到底是谁是谁两倍,

1回答
2020-08-14 22:29
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林昊翔

  twiceasmanymalesasfemales男人是女人的两倍多.

  从后面推起,原来男为女的2倍,离开九人后男为女的一半,设男为X个女为Y个,9=3/2(Y-2),Y=8

  Y-2=X/2,所以X=12.

2020-08-14 22:29:43

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