TIMO Khối 2 — Vòng quốc gia 2019-2020

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