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:141 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。
用方程解:设乙的年龄是x岁。
22×3 + x = 18×2 + 25×2
66 + x = 86
x = 20
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