AMC数学竞赛8专为8年级及以下的初中学生设计，但近年来的数据显示，越来越多小学4-6年级的考生加入到AMC 8级别的考试行列中，而当这些学生能在成绩中取得“A”类标签，则是对孩子数学天赋的优势证明，不管是对美高申请还是今后在数学领域的发展都极其有利！那么接下来跟随小编来看一下AMC 8的官方真题以及官方解答吧：

Problem 3

Four students take an exam. Three of their scores are  and . If the average of their four scores is , then what is the remaining score?

Solution

We can call the remaining score . We also know that the average, 70, is equal to . We can use basic algebra to solve for :giving us the answer of .

Problem 4

When Cheenu was a boy he could run  miles in  hours and  minutes. As an old man he can now walk  miles in  hours. How many minutes longer does it take for him to walk a mile now compared to when he was a boy?

Solution

When Cheenu was a boy, he could run  miles in  hours and  minutes  minutes  minutes, thus running  minutes per mile. When he is an old man, he can walk  miles in  hours  minutes  minutes, thus walking  minutes per mile. Therefore it takes him  minutes longer to walk a mile now compared to when he was a boy.

以上就是小编对AMC竞赛官方真题以及解析的介绍，希望对你有所帮助，更多AMC真题下载请持续关注AMC数学竞赛网！