2012美国数学竞赛AMC8.doc

上海华数教QQ2640199717 华数教育专业中小学奥数辅导，专注美国数学竞赛AMC8、10、12，美国数学邀请赛AIME，美国普林斯顿数学竞赛PUMAC， 2012 AMC 8 Problems Problem 1 Rachelle uses??pounds of meat to make??hamburgers for her family. How many pounds of meat does she need to make?hamburgers for a neighborhood picnic? \o 2012 AMC 8 Problems/Problem 1 Solution Problem 2 In the country of East Westmore, statisticians estimate there is a baby born every??hours and a death every day. To the nearest hundred, how many people are added to the population of East Westmore each year? \o 2012 AMC 8 Problems/Problem 2 Solution Problem 3 On February 13??listed the length of daylight as 10 hours and 24 minutes, the sunrise was?, and the sunset as?. The length of daylight and sunrise were correct, but the sunset was wrong. When did the sun really set? \o 2012 AMC 8 Problems/Problem 3 Solution Problem 4 Peters family ordered a 12-slice pizza for dinner. Peter ate one slice and shared another slice equally with his brother Paul. What fraction of the pizza did Peter eat? \o 2012 AMC 8 Problems/Problem 4 Solution Problem 5 In the diagram, all angles are right angles and the lengths of the sides are given in centimeters. Note the diagram is not drawn to scale. What is ,??in centimeters? \o 2012 AMC 8 Problems/Problem 5 Solution Problem 6 A rectangular photograph is placed in a frame that forms a border two inches wide on all sides of the photograph. The photograph measures 8 inches high and 10 inches wide. What is the area of the border, in square inches? \o 2012 AMC 8 Problems/Problem 6 Solution Problem 7 Isabella must take four 100-point tests in her math class. Her goal is to achieve an average grade of 95 on the tests. Her first two test scores were 97 and 91. After seeing her score on the third test, she realized she can still reach her goal. What is the lowest possible score she could have made on the third test? \o 2012 AMC 8 Problems/Problem 7 Solution Problem 8 A shop advertises everything is half price in to