■ 응모 문제 ■
Young, Jo, Sumy, Mira and their sisters Jiun, Sora, Arrie, Soyoung had 44 chocolates altogether. Young had 2, Jo had 3, Sumy had 4 and Mira had 5. The number of chocolates their sisters had is described in the box below.
Find out who is whose sister.
Jiun had the same number of chocolates as her sister.
Sora had twice as many chocolates as her sister.
Arrie had 3 times as many chocolates as her sister.
Soyoung had 4 times as many chocolates as her sister.
〈Tip!〉
twice as many ∼ as… →…의 두 배의 ∼
찾으려는 수를 미지수로 놓고 식을 만들어 봅시다.
■ 도전! 하나 ■
The following figures are showing lines connecting the beginning and the ending point within each given squares. The lines link the centers of the smaller squares within that they travel through. The numbers around represent the number of the smaller squares that the line passes through either horizontally or vertically.
Complete the following figure.
〈Tip!〉
square → 정사각형
given → 주어진, 설정된
within → 안쪽의
number of the smaller squares that the line passes through → 선이 지나가는 더 작은 정사각형의 개수
horizontally → 가로로
vertically → 세로로
4개의 정사각형을 지나가는 경우 그중 어떤 사각형을 지나가는지 생각하지 않아도 되겠죠?
■ 도전! 둘 ■
The lines in the following figure represent roads, and the numbers their distance. A postman wants to travel along all the roads and get back to the post office. If he takes the shortest route, how many meters does he have to walk in total?
〈Tip!〉
the numbers (represent) distance → 숫자는 거리를 나타낸다.
along ∼ → ∼ 를 따라서
take a route → 경로를 택하다
우체부(집배원)가 굳이 어떤 길을 반복해서 가야 한다면, 어떤 길이 전체 걸은 거리를 줄일 수 있는 길일까요?
■ 도전! 셋 ■
P, who raises pigs, was surprised by seeing Q selling pigs at a market.
It was because while Q had bought 250 pigs for 100 gold coins from P several days before, on that particular day Q was selling the same pigs in his own way. He had divided them in half, into one group of fat ones and one of thin ones, selling two fat ones or three of the thin ones for 1 gold coin. And all the while Q was bragging to the customers that he was not making any profit out of his business since he was selling 5 pigs just for 2 gold coins.
Then did Q really make no profit from selling those pigs? Answer in yes or no.
〈Tip!〉
먼저 P와 Q의 관계를 파악해 봅시다.
Q was selling the same pigs in his own way → Q는 바로 그 돼지들을 자신의 방식으로 팔고 있었다.
on that particular day → 바로 그날
divide ∼ in half into one group of fat ones and one group of thin
ones → ∼을 살찐 무리와 살찌지 않은 무리로 반씩 나누다
all the while → 그러면서, 동시에
brag → 큰소리로 떠들며 자랑하다
make profit out of business → 장사로 이윤을 남기다
마리당 얼마에 사서 얼마에 팔고 있는지 알 수 있습니까?
■ 도전! 넷 ■
There is an error in the following equation made up of match sticks. Make it into a correct equation by moving a single match stick.
〈Tip!〉
match stick → 성냥개비
correct equation → 맞는 등식
■ 도전! 다섯 ■
Minsoo, Youngho and Charles are attending different colleges and are majoring in different majors. The names of their colleges are A, B and C, and their majors are math, physics and chemistry. Reading the conditions, find out who goes to what college and who majors what.
A.Minsoo’s college is not A and Youngho’s college is not B.
B.The major of the student who goes to college A is not chemistry.
C.The major of the student who goes to college B is math.
D.Youngho’s major is not physics.
〈Tip!〉
조건에 두 번이나 언급된 영호에 집중해서 영호의 전공과 대학을 생각해 봅시다. 한 학생이 여러 대학을 동시에 갈 수 없고 동시에 여러 전공을 택할 수도 없다는 것을 기억하세요.