有一水池,开甲管12分钟注满水,开乙管8分钟放完一池水,开丙管20分钟把空池注满,如果先开甲管若干分钟,再三管齐开20分钟则把水池注满,问甲管先开了几分钟...

作者: tihaiku 人气: - 评论: 0
问题 有一水池,开甲管12分钟注满水,开乙管8分钟放完一池水,开丙管20分钟把空池注满,如果先开甲管若干分钟,再三管齐开20分钟则把水池注满,问甲管先开了几分钟?( ) A. 7 B. 8 C. 9 D. 10
选项
答案 D
解析

相关内容:水池,开甲,12分钟,开乙,8分钟,放完,池水,开丙,20分钟,空池,先开,甲管,管齐,问甲,管先,几分钟

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