C :

#include<stdio.h>
void main()
{
	int x,y,z,count=0;
	//printf(" Men Women Children\n");
	//printf("........................................\n");
	for(x=0;x<=10;x++)
	{
		for(y=0;y<=30-x;y++){
			z=30-x-y;
			if(x*3+y*2+z==50){
				printf("%d %d %d\n",x,y,z);
			}
		}
//		y=20-2*x; /*x 定值据(3) 式求y*/
//		z=30-x-y; /* 由(1) 式求z*/
//		if(3*x+2*y+z==50) /* 当前得到的一组解是否满足式(2)*/
//		printf("%d %d %d\n",x,y,z);
	}
}

C++ :

#include <bits/stdc++.h>

using namespace std;

int main(){
	int i,j,x,y;
	for(i = 0;i <= 16;i++){
		x = 50 - i * 3;
		for(j = 0;j <= x/2;j++){ 
			y = x - j * 2;
				if(i + j + y == 30){
				cout<<i<<" "<<j<<" "<<y<<endl;
			} 
		} 
	} 

} 

Python :

for i in range(0, 30):
    for j in range(0, 30):
        for k in range(0, 30):
            if 3 * i + 2 * j + 1 * k == 50 and i + j + k == 30:
                print(str(i) + ' ' + str(j) + ' ' + str(k))