TIMO Khối 6 – Vòng Quốc gia (Heat Round) – Đề số 2

Given A and C are two non-zero digits, we have: 1. CA is divisible by 19; 2. AC can be expressed by a product of 2 prime numbers; Find the 2-digit number CA.

hết cho;

Non-zero digits: Chữ số khác 0; 2-digit numbers: Số có 2 chữ số; Digit: Chữ số; Divisible by: Chia

Product of 2 prime numbers: Tích của 2 số nguyên tố

5 numbers, A, B, C, D and E, represent different numbers from 1 to 9. Given the following conditions: 1. The sum of A and E is less than the sum of C and 5. 2. The sum of A, C and E equals D. 3. The sum of A and D equals B. 4. D is divisible by C. 5. The sum of A and C is less than E. 6. D is greater than 6. Find the number to represent C.

Different numbers: Các số khác nhau; Sum: Tổng; Less than: Ít hơn; Divisible by: Chia hết cho;

Equal: Bằng nhau; Greater than: Lớn hơn.

20 children, numbered 1 to 20, sit around a circle in order. Each child has an integer in hand. The child numbered 1 has the integer 1. The child numbered 2 has the integer 2. The child numbered 3 has the integer 3. Given that the sum of the integers of any 8 consecutive children is equal to 20. What is the integer held by the child numbered 20?

Tổng;

Around a circle: Xung quanh một hình tròn; Integer: Số nguyên; Numbered: Được đánh số; Sum:

Consecutive: Liên tiếp

Equal to: Bằng