野餐趣题 100 students gather at a picnic(野餐).85 of them carry a kite,80 of them have a chocolate; 75 of them have bread; and 70 of them bring a bag.Of course,some of them have all of the above(以上都有):kite,chocolate,bread and bag.Of the
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野餐趣题 100 students gather at a picnic(野餐).85 of them carry a kite,80 of them have a chocolate; 75 of them have bread; and 70 of them bring a bag.Of course,some of them have all of the above(以上都有):kite,chocolate,bread and bag.Of the
野餐趣题
100 students gather at a picnic(野餐).85 of them carry a kite,80 of them have a chocolate; 75 of them have bread; and 70 of them bring a bag.Of course,some of them have all of the above(以上都有):kite,chocolate,bread and bag.Of these 100 students,what is the least possible number (最小的数字) who have all of the above?
一百个同学去参加野餐,其中85人带了风筝,80人带了巧克力,75人带面包,70个人带背包,当然,有的人上述东西全带了.请问至少有多少人全部都带了呢?
野餐趣题 100 students gather at a picnic(野餐).85 of them carry a kite,80 of them have a chocolate; 75 of them have bread; and 70 of them bring a bag.Of course,some of them have all of the above(以上都有):kite,chocolate,bread and bag.Of the
已解决问题收藏 转载到QQ空间 一百个同学去参加野餐,其中85人带了风筝,80人带了巧克力,75人带面包,70个人带背包,当然,有的人上述东西全带了.请问至少有多少人全部都带了呢?
10[ 标签：同学 野餐,风筝,背包 ] 一百个同学去参加野餐,其中85人带了风筝,80人带了巧克力,75人带面包,70个人带背包,当然,有的人上述东西全带了.请问至少有多少人全部都带了呢?问题补充 2010-01-22 16:39
补充：
匿名 回答:9 人气:9 解决时间:2010-02-03 20:33
满意答案100-85=15
100-80=20
100-75=25
100-70=30
15+20+25+30=90
100-90=10
先求出个样东西没带的人有多少,若没有人没带一样以上的东西,则全带的人最少,为10人!
10 人 15没有人带了风筝，20人没有带了巧克力，25人没有带面包，30个人没有带背包，
100-15-20-25-30=10