8个谜语全猜对的有多少人

  • 时间:2020-05-27 19:09:25
  • 分类:数学世界
  • 阅读:102 次

有8个谜语让60个人猜,猜对共338人次。每人至少猜对3个,猜对3个的有6人,猜对4个的有10人,猜对5和7个的人数同样多。8个谜语全猜对的有多少人?(用算术解法或方程解法)

数学题解答:有2种算法,先看算术方法:

未猜对次数:60×8-338=142(人)
猜对5个,6个,7个的人数是:
[142-(8-3)×6-(8-4)×10]÷(8×3-5-6-7)=12(人)
8个全猜对的有:
60-6-10-3×12=8(人)
答:8个全猜对的有8人。

再看方程解法:

解:设猜对8个有X人。
8X+3×6+4×10+(60-X-6-10)÷3×(5+6+7)=338
8X+18+40+(44-X)×6=338
8X+18+40+264-6X=338
2X=16
X=8

答:8个全猜对的有8人。

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