2007 澳洲 AMC C-Junior 真题 答案 详解

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中英双语真题

Junior Exam (Grades 7-8)

Questions 1-10, 3 points each

1. Calculation: 37 - 16 equals
2. (A) 1
3. (B) 9
4. (C) 11
5. (D) 21

6. (E) -21

7. Calculation: ( \frac{6 \times 7}{3} ) equals

8. (A) 7
9. (B) 14
10. (C) 21
11. (D) 1

12. (E) 39

13. In the right figure, PQR is a straight line, then x equals

14. (A) 60
15. (B) 70
16. (C) 80
17. (D) 90

18. (E) 100

19. My mom parked her car at 11 am, 5 hours later she went to get it. At what time did she go to get it?

20. (A) 6 pm
21. (B) 5 pm
22. (C) 4 pm
23. (D) 3 pm

24. (E) 2 pm

25. Among the five numbers: 3.1, 0.6, 3, 6, and 0.5, the sum of the largest and smallest number is

26. (A) 6
27. (B) 9
28. (C) 6.1
29. (D) 6.6

30. (E) 6.5

31. Xiao Liu wants to find the sum of 97 and 298. He first adds 100 and 300. How much more does he need to subtract to get the value of 97 + 298?

32. (A) 2
33. (B) 3
34. (C) 5
35. (D) 6

36. (E) 15

37. The price of one basket of mangoes is $46. Each basket contains 5 rows with 6 mangoes per row. What is the cost of three baskets of mangoes?

38. (A) $4
39. (B) $4.20
40. (C) $4.30
41. (D) $4.60
42. (E) $5

英文真题

Junior Division
Questions 1 to 10, 3 marks each

1. The value of (37 - 16) is
   (A) 1
   (B) 9
   (C) 11
   (D) 21
   (E) -21

2. The value of (\frac{6 \times 7}{3}) is
   (A) 7
   (B) 14
   (C) 21
   (D) 1
   (E) 39

3. In the diagram, where (PQR) is a straight line, (x) equals
   (A) 60
   (B) 70
   (C) 80
   (D) 90
   (E) 100

4. My mother left her car in the car park at 11 am and returned 5 hours later. The time when she returned was
   (A) 6 pm
   (B) 5 pm
   (C) 4 pm
   (D) 3 pm
   (E) 2 pm

5. The sum of the smallest and largest of the five numbers 3.1, 0.6, 3, 6 and 0.5 is
   (A) 6
   (B) 9
   (C) 6.1
   (D) 6.6
   (E) 6.5

6. Tony wanted to add 97 to 298 and first added 100 to 300. What must he now subtract from this result to obtain (97 + 298)?
   (A) 2
   (B) 3
   (C) 5
   (D) 6
   (E) 15

7. A tray of mangoes costs $46. Each tray has 5 rows with 6 in each row. The cost of three mangoes is
   (A) $4
   (B) $4.20
   (C) $4.30
   (D) $4.60
   (E) $5

真题文字详解(英文)

Junior Division
1. 37 - 16 = 21
hence (D).
2. ( \frac{6 \times 7}{3} = 2 \times 7 = 14 ), hence (B).
3. (Also I2)
PQR is a straight line, so ( x + 25 + 75 = 180 ).
So ( x = 180 - 100 = 80 ).
hence (C).
4. Five hours after 11 am is 4 pm,
hence (C).
5. The largest and smallest of the five numbers 3.1, 0.6, 3, 6, 0.5 are 6 and 0.5, with sum 6.5,
hence (E).
6. His result is 100 + 300 while the correct answer is 97 + 298. 100 is 3 more than 97 and 300 is 2 more than 298. Hence his answer is too big by 3 + 2 and so he must subtract 5,
hence (C).
7. The cost of five rows of mangoes with six in each row is $46. So 30 mangoes will cost $46 and 3 mangoes will cost $45 ÷ 10 = $4.60,
hence (D).
8. 16 of the smallest triangles make up the largest triangle.
(A)
(B)
(C)