#include <stdio.h>
int main()
{
int n = 0;
float pop = 60.0f;
while (pop < 80.0f)
{
n++;
pop = pop * 1.014;
}
printf("%d", n);
}

21

#include <stdio.h>

int f(int n)
{
    int a = n % 10;
    int b = (n / 10) % 10;
    int c = n / 100;
    /* return (a + b) % 10 == c && 
        ((a % 2 == 1 ? a : 0) + (b % 2 == 1 ? b : 0) + (b % 2 == 1 ? b : 0) == c);
    */
    return (a + b) % 10 == c && c % 2 == 0;
}

int main()
{
    int sum = 0;
    for (int i = 111; i <= 999; i++)
    {
        if (f(i)) { sum += i; printf("%d ", i); }
    }
    printf("\n%d", sum);
    return 0;
}

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21980

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