数学题:调查发现,该学校七年级参加魔方比赛的学生中

  • 时间:2020-05-01 11:05:58
  • 分类:数学世界
  • 阅读:135 次

数学题:调查发现,该学校七年级参加魔方比赛的学生中,男生人数是女生的2倍,男生、女生获奖人数分别为70人和45人,女生获奖率比男生高12.5%,求七年级参加魔方比赛总人数。

数学题解答:设女生为x人。求出x后,再算男生人数,最后求出总人数。

45÷x – 70÷(2x)=12.5%

方程两边同时乘x,得:

12.5%x = 45-35

x = 80

男生人数:80×2=160(人)

总人数:80+160=240(人)

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