Uva 12502 - Three Families

/*
        Uva 12502 - Three Families
        Verdict : Accepted
         Time : : 0.000
*/
#include <iostream>
#include <cstdio>
#include <cstring>
#include <string>
#include <vector>
#include <cmath>
#include <cctype>
#include <set>
#include <list>
#include <stack>
#include <queue>
#include <algorithm>
#define sf scanf
#define pf printf
#define N 10000
#define MOD 10000000007
#define pb push_back
#define ps push
#define clr clear

using namespace std;

int main()
{
    int t; cin >> t;

    while (t--)
    {
        double x,y,z,a,b,c,d;
        double tc;

        sf ("%lf%lf%lf",&x,&y,&z);

        if (x<y)
        {
            a = (z*x)/(x+y); //pf (" %lf ",a);
            b = (z*y)/(x+y);//pf (" %lf ",b);
            c = b-a; //pf (" %lf ",c);
            d = a-c; //pf (" %lf ",d);
            tc = d;

           if (tc<=0.0)
            {
                pf ("0\n");
            }

            else
            {
                pf ("%0.lf\n",tc);
            }
        }

        else
        {
            a = (z*x)/(x+y); //cout << a << " ";
            b = (z*y)/(x+y);//cout << b << " ";
            c = a+(a-b);
            tc = c ; //cout << c << " ";

            if (tc<=0.0)
            {
                pf ("0\n");
            }

            else
            {
                tc = c;

                pf ("%0.lf\n",tc);

            }
        }

        //cout << endl;
    }

    return 0;
}