数学题:学校把两捆树苗分给三个年级种植

  • 时间:2020-06-05 20:41:20
  • 分类:数学世界
  • 阅读:94 次

数学题:学校把两捆树苗分给三个年级种植,六年级分得全部树苗的5/12(十二分之五),四、五年级分得树苗的比是3:4,已知第一捆树苗的棵数是第二捆的7/8,如果从第二捆中拿出8棵放到第一捆中,则两捆树苗的棵数相等,问三个年级各分得树苗多少棵?

数学题解答:要算出各年级分得的树苗数,需先求出两捆树苗的棵数。

根据“如果从第二捆中拿出8棵放到第一捆中,则两捆树苗的棵数相等”可知,第二捆比第一捆多:8+8=16(棵)

第二捆的棵数:16÷(1 – 7/8) = 128(棵)

第一捆的棵数:128 – 16 = 112(棵)

六年级分到的:(128 + 112) × 5/12 = 100(棵)

五年级分到的:(240 – 100) ÷(3+4)×4 = 80(棵)

四年级分到的:(240 – 100) ÷(3+4)×3 = 60(棵)

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