2018年环亚太杯三年级竞赛初赛第12题
\textbf{(2009 Math kangaroo Problems, Level 1-2, Question \#7)}  After Snow White, the Prince and the 7 Dwarfs ate one apple each, there were 4 apples left in the basket. How many apples were there in the basket before they ate any？  翻译：在白雪公主之后，王子和七个小矮人也每人吃了$$1$$个苹果，篮子里还剩下$$4$$个苹果．那么他们吃苹果之前篮子里有多少苹果？ 
拓展思维->能力->逻辑分析
吃掉的苹果加上篮子里剩下的苹果就是原来一共的苹果数量．白雪公主吃了一个苹果，王子吃了一个苹果，再加上七个小矮人各吃了一个苹果，所以一共吃了$$1+1+7=9$$个苹果，再加上篮子里还剩下的$$4$$个苹果，那么原来没吃苹果之前就有$$9+4=13$$个苹果． 