教室人数计数器里有若干人,走了10个女生后,男生人数是女生人数的1.5倍,又走了10个女生后,男生人数是女生

教室里有若干学生,走了十名女生后,男生是女生人数的两倍,又走了九名男生后,女生是男生人数的五倍。问_百度知道The page is temporarily unavailable
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site or edit the error_page directive in
the nginx configuration file
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狮子爱4319
解;设原有的女生x人,(x-10)×1.5=(x-10-10)×4,&&&&&1.5x-15=4x-80,&&1.5x-15+15=4x-80+15,&&&&&&&&1.5x=4x-65,&& 1.5x-1.5x=4x-65-1.5x,&&&&&2.5x-65=0,& 2.5x-65+65=65,&&&&&&& 2.5x=65,&&&&&&&&&& x=26,(26-10)×1.5=24(人),26+24=50(人).答:阅览室里原来有50名学生.
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其他类似问题
设原有的女生x人,走了10个女生后x-10,男生人数:(x-10)×1.5,又走了10个女生后:x-10-10,男生人数;(x-10-10)×4,根据男生人数不变,列方程为:(x-10)×1.5=(x-10-10)×4,解答即可.
本题考点:
分数和百分数应用题(多重条件).
考点点评:
解决此题的关键是根据男生人数不变,找出数量间的相等关系,列式解答.
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