To find the even multiples of 45, we need to find the multiples of 90 (since 45 * 2 = 90, and any multiple of 90 will be even).

Let's first find the first even multiple of 45 that is greater than 449. We can do this by dividing 449 by 90 and rounding up to the nearest whole number:

449 / 90 = 4.988888888888889

Rounding up, we get 5. So the first even multiple of 45 greater than 449 is 5 * 90 = 450.

Now, let's find the certain number that gives us 6.022222222222222 even multiples of 45. Since we know that 6 even multiples of 45 are between 450 and the certain number, we can multiply 6 by 90 to find the total span of these multiples:

6 * 90 = 540

Since we started counting from 450 (the first even multiple of 45 after 449), we need to add this span to 450 to find the certain number:

450 + 540 = 990

So the certain number is 990. However, we need to check if 990 itself is an even multiple of 45. Since 990 is divisible by 90 (990 / 90 = 11), it is indeed an even multiple of 45.

Therefore, the certain number we are looking for is 990.
45의 짝수 배수를 찾으려면 90의 배수를 찾아야 합니다(45 * 2 = 90이므로 90의 배수는 모두 짝수이므로).

먼저 45의 첫 번째 짝수 배수 중 449보다 큰 것을 찾습니다. 449를 90으로 나누고 가장 가까운 정수로 반올림하면 됩니다:

449 / 90 = 4.988888888888889

반올림하면 5가 됩니다. 따라서 45의 첫 번째 짝수 배수 중 449보다 큰 5 * 90 = 450이 됩니다.

이제 45의 6.0222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222