5个空瓶可以换1瓶汽水,某班同学喝了161瓶汽水,其中有一些是用喝剩下来的空瓶换的,那么他们至少要买汽水多少瓶?(  ) A.129瓶 B.128瓶 ...

作者: tihaiku 人气: - 评论: 0
问题 5个空瓶可以换1瓶汽水,某班同学喝了161瓶汽水,其中有一些是用喝剩下来的空瓶换的,那么他们至少要买汽水多少瓶?(  ) A.129瓶 B.128瓶 C.127瓶 D.130瓶
选项
答案 A
解析 至少要买129瓶汽水,因为买129瓶汽水,可得到129个空瓶,换得125÷5=25瓶汽水,得到25+(129-125)=29个空瓶,再换得25÷5=5瓶汽水,得到5+(29-25)=9个空瓶。先换1瓶汽水,共得1+(29-25)=5个空瓶,仍可换1瓶汽水,总共喝汽水129+25+5+1+1=161瓶。

相关内容:空瓶,汽水,某班,同学,161瓶,用喝

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