AMC8,--,2006年真题解析( 二 )


文章图片



Answer: E
Solution:
Males which listen are (136-58)=78. The total males which surveyed are 78+26=104. Thus the percentage of males surveyed listen to the station is 78/104=75%.


AMC8,--,2006年真题解析
文章图片



Answer: C
Solution:
After looking at the problem ,we immediately notice that terms cancel out ,leaving us with 2006/2=1003.


AMC8,--,2006年真题解析
文章图片



Answer: A
Solution:
The length of the rectangle will relate invertly to the width ,specifically using the theorem l=12/3. The only graph that could represent a inverted relationship is A. (The rest are linear graphs that represent direct relationships ,therefore they are incorrect.)


AMC8,--,2006年真题解析
文章图片



Answer: C
Solution:
There is 1 integer whose digits sum to 1: 10.;There are 4 integers whose digits sum to 4: 13 , 22 ,31 ,40. ; There are 9 integers whose digits sum to 9: 18 ,27 ,36 ,45 ,54 ,63 ,72 ,81 ,90. ; There are 3 integers whose digits sum to 16: 79 ,88 ,97. Two digits cannot sum to 25 or any greater square since the greatest sum of digits of a two-digit number is 9+9=18. Thus ,the answer is 1+4+9+3=17.


AMC8,--,2006年真题解析
文章图片



Answer: D
Solution:
70%*10=7; 80%*20=16; 90%*30=27. Adding them us gets 7+16+27=50. The overall percentage correct would be 50/60=83.


AMC8,--,2006年真题解析
文章图片



Answer: D
Solution:
If Cassie leaves half an hour earlier then Brian ,when Brian starts ,the distance between them will be 62-12/2=56. Every hour ,they will get 12+16=28 miles closer. 56/28=2 ,so 2 hours from AM is when they meet ,which is .


AMC8,--,2006年真题解析
文章图片





AMC8,--,2006年真题解析


推荐阅读