UVA 12502 Three families

#include<bits/stdc++.h>
using namespace std;
int main()
{
    double x,y,z,k,result;
    int t;
    scanf("%d",&t);
    while(t-- && scanf("%lf%lf%lf",&x,&y,&z)==3)
    {
       k=(x+y)/3;
       result=(z/k)*(x-k);
       if(result<=0)
       {
           result=0;
       }

       printf("%.0lf\n",result);
    }

    return 0;

}