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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決 
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10-6 小6數學問題
Jan 12th 2014, 10:35

減去1元硬幣，剩下的有55個硬幣，合計375元。
若55個都是5元硬幣，那只值275元，尚欠100元。
若一個10元硬幣代替一個5元硬幣，那總值可多5元，20個就多100元了。

所以有20個10元硬幣，35個5元硬幣。


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