2003 袋鼠数学 C-Benjamin 真题 答案 详解

英文真题

European contest - game "Math Kangaroo" 2003 Grades 5 and 6 Part A: Each correct answer is worth 3 points. 1) Which of the following is the greatest number? A) 2 + 0 + 0 + 3 B) 2 x 0 x 0 x 3 C) (2 + 0) x (0 + 3) D) 20 x 0 x 3 E) (2 x 0) + (0 x 3) 2) Sophie draws kangaroos: a blue one, then a green, then a red, then a black, a blue, a green, a red, a black, and so on... What colour is the 29th kangaroo? A) blue B) green C) red D) black E) it's impossible to know 3) How many integers can one find in the interval from 2.09 to 15.3? A) 13 B) 14 C) 11 D) 12 E) infinitely many 4) Which is the smallest positive integer divisible by 2, 3, and 4? A) 1 B) 6 C) 12 D) 24 E) 36 5) The sum of the numbers in each ring should be 55. What is the value of A? A) 9 B) 10 C) 13 D) 16 E) 17 6) Tom has 9 bills of 100 euro, 9 bills of 10 euro, and 10 coins of 1 euro. How many euro does he have in total? A) 1000 B) 991 C) 9910 D) 9901 E) 99010 7) Betty likes calculating the sum of the digits that she sees on her digital clock (for instance, if the clock shows 21:17, then Betty gets 11). What is the biggest sum she can get if the clock is a 24-hour clock? A) 24 B) 36 C) 19 D) 25 E) another answer 8) In the picture, AC=10m, BD=15m, AD=22m. Find BC. A) 1m; B) 2m; C) 3m; D) 4m; E) 5m