2008 袋鼠数学 D-Cadet 真题 答案 详解

英文真题

International Kangaroo Mathematics Contest 2008 Cadet Level: Class (7 & 8) Max Time: 2 Hours 3-point problems 1) How many pieces of string are there in the picture? A) 3 B) 4 C) 5 D) 6 2) In a class there are 9 boys and 13 girls. Half of the children in this class have got a cold. How many girls at least have a cold? A) 0 B) 1 C) 2 D) 3 3) 6 kangaroos eat 6 sacks of grass in 6 minutes. How many kangaroos will eat 100 sacks of grass in 100 minutes? A) 100 B) 60 C) 6 D) 600 4) Numbers 2, 3, 4 and one more number are written in the cells of 2 × 2 table. It is known that the sums of the numbers in the first row are equal to 9, and the sum of the numbers in the second row is equal to 6. The unknown number is A) 5 B) 6 C) 7 D) 8 5) The triangle and the square have the same perimeter. What is the perimeter of the whole figure (a pentagon)? A) 24 cm B) 28 cm C) 32 cm D) It depends upon the triangle measures