2012 袋鼠数学 B-Ecolier 真题 答案 详解

英文真题

International Kangaroo Mathematics Contest 2012 - Ecolier Level Ecolier (Class 3 & 4) Time Allowed : 2 hours SECTION ONE - (3 points problems) 1. Basil wants to write the word MATHEMATICS on a sheet of paper. He wants different letters to be coloured differently, and the same letters to be coloured identically. How many colours will he need? (A) 7 (B) 8 (C) 9 (D) 10 (E) 13 2. In four of the five pictures the white area is equal to the grey area. In which picture are the white area and the grey area different? (A) (B) (C) (D) (E) 3. Father hangs the laundry outside on a clothesline. He wants to use as few pegs as possible. For 3 towels he needs 4 pegs, as shown. How many pegs does he need for 9 towels? (A) 8 (B) 10 (C) 12 (D) 14 (E) 16 4. Iljio colours the squares A2, B1, B2, B3, B4, C3, D3 and D4. Which coloring does he get? (A) (B) (C) (D) (E) 5. 13 children are playing hide and seek. One of them is the "seeker" and the others hide. After a while 9 children have been found. How many children are still hiding? (A) 3 (B) 4 (C) 5 (D) 9 (E) 22 1 of 5