美國(guó)數(shù)學(xué)競(jìng)賽amc題目與答案

1、.. . . .. 學(xué)習(xí)好幫手 2.3.What is the value of ? 4.Eight friends ate at a restaurant and agreed to share the bill equally. Because Judi forgot her

2、money, each of her seven friends paid an extra $2.50 to cover her portion of the total bill. What was the total bill? 5.Hammie is in the grade and weighs 106 pounds. His quadruplet sisters are tiny babies and weigh 5,

3、5, 6, and 8 pounds. Which is greater, the average (mean) weight of these five children or the median weight, and by how many pounds? 6.The number in each box below is the product of the numbers in the two boxes that tou

4、ch it in the row above. For example, . What is the missing number in the top row? .. . . .. 學(xué)習(xí)好幫手 13. When Clara totaled her scores, she inad

5、vertently reversed the units digit and the tens digit of one score. By which of the following might her incorrect sum have differed from the correct one? 14. Let the two digits be and . The correct score was . Clara

6、misinterpreted it as . The difference between the two is which factors into . Therefore, since the difference is a multiple of 9, the only answer choice that is a multiple of 9 is . 15. If , , and , what is the pr

7、oduct of , , and ? 16. A number of students from Fibonacci Middle School are taking part in a community service project. The ratio of -graders to -graders is , and the the ratio of -graders to -graders is . What

8、is the smallest number of students that could be participating in the project? 17. The sum of six consecutive positive integers is 2013. What is the largest of these six integers? 18. Isabella uses one-foot cubical blo