数学题:甲乙丙三人的平均年龄为22岁

  • 时间:2020-06-05 20:41:20
  • 分类:数学世界
  • 阅读:138 次

数学题:甲乙丙三人的平均年龄为22岁 ,如果甲,乙的平均年龄是18岁,乙,丙的平均年龄是25岁,那么乙的年龄是几岁?

数学题解答:这是一道关于平均数的问题,需要用到关系式“平均数×份数=总数”。

甲+乙 + 乙+丙 -(甲+乙+丙)=乙

18×2 + 25×2 – 22×3

=36+50-66

=86-66

=20(岁)

答:乙的年龄是20岁。

方程解:设乙的年龄是x岁。

22×3 + x = 18×2 + 25×2

66 + x = 86

x = 20

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