TIMO Khối 2 – Vòng Quốc gia (Heat Round) – Đề số 4

Alice wrote a 2-digit number on a piece of paper and asked Bobby to guess it. Bobby asked: "Is the number 68?" Alice replied: "One of the digits is correct, the position of that digit is wrong." Bobby asked again: "Is the number 17?" Alice replied: "One of the digits is correct, the position of that digit is wrong." Bobby asked again: "Is the number 79?" Alice said: "One of the digits is correct, the position of that digit is correct." What is the number written by Alice? 2-digit number:

Số có 2 chữ số; Digit: Chữ số; Number: Số; The position of that digit: Vị trí của chữ số đó; Correct: Đúng; Wrong: Sai.

When Bruce was born, mum was 29 years old. When Bruce will be 28 years old, how old will mum be?

Born: Sinh ra; Years old: Tuổi.

According to the pattern shown below, what is the number in the blank? 12 、 15 、 21 、 30 、 42 、 57 、 __

Pattern: Quy luật; Number: Số; Blank: Chỗ trống.