[신나는 공부]Let's Think! 영어사고력 문제

■응모 문제■

How many times does the sum of each digit in the digital clock such as the one below become more than 20 in a morning?

Tip!

digit → 숫자

디지털시계의 각 숫자를 더한 값이 오전에 20이 넘는 경우는 몇 번인지 묻는 문제입니다. morning은 ‘아침’이라는 뜻 외에 ‘오전’이라는 뜻도 있지요. 즉 자정에서 정오까지의 시간입니다.

■도전! 하나■

Chul-soo wants to have his birthday party. He wants to make ten of his friends, A, B, C … J, come to his party, but wants to send the minimum number of invitations. Some of his friends have certain tendencies as listed below. How many invitations should he send?

-E follows wherever A or B goes.

-Where B and F go, H and I go, too.

-Wherever two people among C, D, G, and I go together, the other two should also go, too.

Tip!

tendency → 경향, 성향

예를 들어 G와 I가 어디에 간다면 C와 D도 따라가니, 이 넷을 부르고 싶다면 두 명만 초대하면 된다는 이야기입니다. 열 명의 친구를 부르려면 몇 명만 초대하면 될까요?

■도전! 둘■

Find the three different single-digit numbers that each of the symbols in the following equation represents, and list them from the smallest to the largest.

Tip!

single-digit number → 한 자릿 수

equation → 등식

represent → 나타내다

네 개의 숫자를 곱한 값과 더한 값이 같아야 한다는 이야기입니다.

■도전! 셋■

A bus has the following fare: 900 won for an adult, and 500 won for a child. The bus travelled part of its route and counted the fare it had collected: it was 56100 won. What are the maximum and the minimum number of travellers who could have been in the bus? Give the sum of these two numbers.

Tip!

fare → (교통수단 등의) 요금

route → 경로

collect → (요금을) 수금하다.

What are the maximum and the minimum number of travellers that could have been in the bus? → 버스에 탈 수 있었던 최소한의 승객 수와 최대한의 승객 수는 얼마인가?

■도전! 넷■

In village A, men are called ‘ChiChi,’ while women are called ‘KuKu.’ However, in village B, women are called ‘ChiChi,’ and men are called ‘KuKu.’ A curious visitor asked if a person was a ChiChi or a KuKu to all the inhabitants of the two villages, and the people who answered, "I am a ChiChi," were one fifth of the whole. If women are one tenth of the population in each of these two villages, how many times is the population of A that of B?

Tip!

curious → 호기심 많은

inhabitant → 거주자

one fifth of the whole → 전체의 5분의 1

how many times is the population of A that of B? → A의 인구는 B의 인구의 몇 배 입니까?

두 마을에서 각각 여성의 비율이 10분의 1이라면, A 마을에서 ChiChi의 비율은 얼마일까요?

■도전! 다섯■

Below is a treasure map. The numbers represent the number of treasures located on the same row and column as where the number is. But there is no treasure at the spot where the number is written. Refer to the example below. You can guess where the treasures are, which are represented with the star signs.

Now look at the following map. How many treasures are there?

Tip!

treasure→ 보물

row → 행

column → 열

Refer to ∼ → ∼을 참고하라

각 숫자는 해당되는 행과 열의 보물의 숫자의 합을 나타냅니다.

☞ 정답을 맞힌 학생 중 5명을 선정해 5만 원 상당의 문화상품권을 드립니다. CMS 홈페이지(www.cmsonlin.co.kr) 코너에서 응모방법과 원어민동영상 강의를 보실 수 있습니다.