2012 袋鼠数学 C-Benjamin 真题 答案 详解

英文真题

International Kangaroo Mathematics Contest 2012 - Benjamin Level Benjamin (Class 5 & 6) Time Allowed : 3 hours SECTION ONE - (3 points problems) 1. Basil wants to paint the slogan VIVAT KANGAROO on a wall. 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. A blackboard is 6 m wide. The width of the middle part is 3 m. The two other parts have equal width. How wide is the right-hand part? (A) 1 m (B) 1,25 m (C) 1,5 m (D) 1,75 m (E) 2 m 3. Sally can put 4 coins in a square built with 4 matches (see picture). At least how many matches will she need in order to build a square containing 16 coins that do not overlap? (A) 8 (B) 10 (C) 12 (D) 15 (E) 16 4. In a plane, the rows are numbered from 1 to 25, but there is no row number 13. Row number 15 has only 4 passenger seats, all the rest have 6 passenger seats. How many seats for passengers are there in the plane? (A) 120 (B) 138 (C) 142 (D) 144 (E) 150 5. When it is 4 o'clock in the afternoon in London, it is 5 o'clock in the afternoon in Madrid and it is 8 o'clock in the morning on the same day in San Francisco. Ann went to bed in San Francisco at 9 o'clock yesterday evening. What was the time in Madrid at that moment? (A) 6 o'clock yesterday morning (B) 6 o'clock yesterday evening 1 of 8

中英双语真题

International Kangaroo Mathematics Contest 2012 - Benjamin
Level Benjamin (Class 5 & 6)
Time Allowed: 3 hours

SECTION ONE - (3 points problems)

1. Basil wants to paint the slogan "VIVAT KANGAROO" on a wall. He wants different letters to be colored differently, and the same letters to be colored identically. How many colors will he need?
   (A) 7 (B) 8 (C) 9 (D) 10 (E) 13

2. A blackboard is 6 m wide. The width of the middle part is 3 m. The two other parts have equal width. How wide is the right-hand part?
   (A) 1 m (B) 1.25 m (C) 1.5 m (D) 1.75 m (E) 2 m

3. Sally can put 4 coins in a square built with 4 matches (see picture). At least how many matches will she need in order to build a square containing 16 coins that do not overlap?
   (A) 8 (B) 10 (C) 12 (D) 15 (E) 16

4. In a plane, the rows are numbered from 1 to 25, but there is no row number 13. Row number 15 has only 4 passenger seats, all the rest have 6 passenger seats. How many seats for passengers are there in the plane?
   (A) 120 (B) 138 (C) 142 (D) 144 (E) 150

5. When it is 4 o'clock in the afternoon in London, it is 5 o'clock in the afternoon in Madrid and it is 8 o'clock in the morning on the same day in San Francisco. Ann went to bed in San Francisco at 9 o'clock yesterday evening. What was the time in Madrid at that moment?
   (A) 6 o'clock yesterday morning (B) 6 o'clock yesterday evening