男生人数的40%比女生人数的一半还多3人

  • 时间:2020-05-20 15:29:31
  • 分类:数学世界
  • 阅读:164 次

数学题:六年级一班有学生39人,其中男生人数的40%比女生人数的一半还多3人,六年级一班男生有多少人?

数学题解答:此题用方程解答比较容易,题中含有两个未知数,男生、女生人数都不知道。设男生为x人,则女生可以表示为(39-x)。根据题目描述,分析出数量关系:

男生人数的40%=女生人数的1/2 + 3

可列出方程:

40%x = (39-x) × 1/2 + 3

40%x = 39/2 - 1/2 x + 3

40%x + 1/2 x = 45/2

90%x = 45/2

x = 45/2 × 90%

x = 25

答:六年级一班男生有25人。 

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