191问答库 > 有三种1角、5角和1元的硬币共15枚7元,求三种硬币各有几枚?（请用方程解）

有三种1角、5角和1元的硬币共15枚7元,求三种硬币各有几枚?（请用方程解）

2025-03-15 12:41:29
推荐回答（1个）
回答1：

设三种硬币分别有：x,y,z枚.
有：
x+y+z=15
0.1x+0.5y+z=7
求整数解,考虑5个1角与5角的硬币凑整,取x=5试算,结果成功解得：
x=5
y=7
z=3
答：1角、5角和1元三种硬币分别有5枚,7枚,3枚.

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