C :

#include<stdio.h>
int main()
{
    int a=100,b=10,c=20,i;
    
    if(a%b==0)
    {
        for(i=1;i<=a/b-1;i++)
        {
               if(((a-b*i)%c==0)&&((a-b*i)>=c))
               {
                       printf("%d %d\n",i,(a-b*i)/c);
               }
        }
    }
    if(a%b!=0)
    {
        for(i=1;i<=a/b;i++)
        {
               if(((a-b*i)%c==0)&&((a-b*i)>=c))
               {
                   printf("%d %d\n",i,(a-b*i)/c);
               }
        }
    }
    return 0;
}

C++ :

#include <bits/stdc++.h>
using namespace std;

int main(){
	for(int i = 1;i <= (100 - 20) / 10;i++){
		int x = 100 - i * 10;
		if(x % 20 == 0){
			cout<<i<<" "<<x / 20<<endl;
		}
	}
}

Java :

public class Main {
	public static void main(String[] args) {
	for(int i = 1;i <= 8;i++) {
		for(int j = 4;j >= 1;j--) {
			if(i * 10 + j * 20 == 100 && i != 0 && j != 0) {
				System.out.println(i + " " + j);
			}
		}
	}
}
}

Python :

for i in range(1, 100):
    for j in range(1, 50):
        if 10 * i + 20 * j == 100:
            print(i, end=' ')
            print(j)
print()