一个文具盒卖价5元，如果小东买了这个文具盒，小东与小鹏的钱数之比是2：5，如果小鹏买了这个文具，则小东与小鹏的钱数之比是8：13，小东原来有多少钱？
5÷（
-8 8+13
）×2 2+5
，8 8+13
=5÷（
-8 21
）×2 7
，8 21
=5÷
×2 21
，8 21
=52.5×
，8 21
=20（元）；
答：小东原来有20元钱．
Last Tuesday, a little girl died after eating some fried chicken. Her father bought the chicken for her from a street seller in Fenzhuang Village, Fengtai,Beijing.After testing the girl, the doctor said she was poisoned (中毒) by nitrites(亚硝酸盐). Some experts suggest that we should buy foods with QS signs. They are safer. After hearing about the accident, many people feel more worried about the food safety because there have been many food safety problems in our country these years. For example, poisonous(有毒的) rice, oil, milk and so on have been found out recently. People feel quite afraid because these poisonous foods are rather bad for their health and even kill them. They want the government to do something to stop such poisonous foods and drinks appearing again so that they can have safe and healthy foodsand drinks. InformationCard
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