[신나는 공부]Let's Think! 영어사고력 문제

■ 응모문제 ■

There is a strange mushroom in the Land of Oz. Every day it grows twice as big as it used to be the day before. Let’s say it took 100 days for the mushroom to grow as large as it can fill one entire cave. How long would it take for two such mushrooms to grow to fill in the same cave?

Tip. the day before → 그 전날
as large as it can fill∼ → ∼을 채울 수 있을 정도로 크게
one entire cave → 동굴 하나 전체
버섯 하나가 동굴 하나를 다 채우는 데 99일이 걸렸다고 합니다. 그럼 똑같은 버섯이 동굴의 반을 채우는 데는 며칠이 걸릴까요?

■ 도전! 하나 ■

he numbers below follow a certain rule.

The number 88 and 63 together produces 25, and 25 and 9 makes 16. Fill in the blank.

Tip. 단순히 합이나 차에만 집착하지 말고 이를 비롯한 여러 가지 방법을 시도해 봅시다.

■ 도전! 둘 ■

Professor Dumbledore showed 2 white hats and 3 black hats to his students. Then he picked 3 hats among them and put them on Hermione, Ron and Harry. Since they were in a line, they could only see the hats of the people in front; they could not see the hat of themselves or that of the person behind. Professor Dumbledore asked them to find out the color of their hats they were wearing in an order of Harry, Ron and Hermione.

Harry, the last one in the line, said “I don’t know”. Ron, in the middle, after thinking about it for a while said, “I don’t know either”. Hermione, after listening to the answers of others showed a knowing expression, saying, "Aha! The color of my hat is _____. "

Find out the color of Hermione’s hat and explain how she got her answer.

Tip. in a line → 일렬로
in the order of A, B and C → A, B, C의 순서로
show a knowing expression → 뭔가 알겠다는 표정을 짓다
Harry가 자신의 모자의 색깔을 알 수 있으려면 Ron과 Hermione의 모자의 색깔은 무엇이어야 했을까요?

■ 도전! 셋 ■

Look at the following crypt carefully. What is the answer?

Tip. crypt → 암호
‘What is the answer?’ 가 문제이니 아래 암호에 질문이 있다는 뜻이겠죠?

■ 도전! 넷 ■

There is a square-shaped land looking like the one below. A river, the width of which is 2m evenly, flows through it. What is the area of the land excluding the area where the river is?

Tip. square → 정사각형
width → 폭
evenly → 균일하게
area → 넓이
폭이 균일한 강물 부분의 넓이는 어떻게 구할 수 있을까요?

■ 도전! 다섯 ■

A, B, C and D had a ba-duk league. Everyone played once or more with others. The result is as follows:

A: 1 win and 2 defeats

B: 3 wins and 0 defeat

C: 0 win and 4 defeats

How many wins and defeats did D have?

Tip. Everyone played once or more with others → 모든 사람이 적어도 한 번씩 다른 사람과 경기를 했습니다.
∼ wins and ∼ defeats → ∼ 승 ∼ 패

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