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212. 20491-!-item-!-187;#058&012823 This morning, a certain sugar container was full. Since then some of the sugar from this container was used to make cookies. If no other sugar was removed from or added to the container, by what percent did the amount of sugar in the container decrease? (1) The amount of sugar in the container after making the cookies would need to be increased by 30 percent to fill the container. (2) Six cups of sugar from the container were used to make the cookies. 【答案】A
关于A,我的算法是: 设total sugar :X; used sugar: Y; 求:Y/X (1)-> ( X-Y) *( 1+30% )=X -> Y/X=3/13;
但我看到前辈答案给的是70%; 我想前辈认为30%是基于容器的比率,可我觉得它是基于剩下的糖的比率呀! 请指教,谢谢! |
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