2010 袋鼠数学 B-Ecolier 真题 答案 详解

英文真题

International Kangaroo Mathematics Contest 2010 Ecolier Level: Class (3 & 4) Max Time: 2 Hours 3-point problems Q1) There is a maze on the picture for a cat and a mouse. The cat can reach the bowl with milk, mouse can reach the cheese, but cat and mouse will never meet. How does the hidden part of the maze look like? A) B) Q2) A 40 minutes lesson started at 11:50. Exactly at the middle of the lesson, a bird flew into the classroom suddenly. When did that happen? A) 12:10 B) 12:20 Q3) Indian chief has three feathers, an axe, arrows and moccasins on feet. His son has two feathers, arrows, doesn't have an axe, he is barefooted and has two stripes drawn on his chest. Which picture shows the chief together with his son? A) B) Q4) In this restaurant, first course costs 4€, main course 9€ and dessert 5€. The Menu, which is first course + main course + dessert, costs 15€. How much does someone save if he orders the Menu instead of the three separate courses. A) 3€ B) 4€ Q5) Six coins are lying in a triangle. You have to move some coins to place them in a circle as you can see in the second picture. How many coins must be moved at least? A) 2 B) 3