6.3. A row of numbers and asterisks is written on the board: $5, *, *, *, *, *, *, 8$. Replace the asterisks with numbers so that the sum of any three consecutive numbers equals 20.
Answer: $5,8,7,5,8,7,5,8$.

The sum of the first, second, and third numbers should be equal to 20, and the sum of the second, third, and fourth numbers should also be equal to 20. Therefore, the fourth number must be equal to the first, which is five. Similarly, the seventh number must be equal to the fourth, so the seventh number is also 5. From this, we find the sixth number: $20-8-5=7$, and then we find the other numbers.

+ the correct answer is provided (regardless of the presence of explanations)

$\pm$ along with the correct answer, an incorrect one is also provided