#include<stdio.h>
#include <math.h>
int main()
{
int a,b,c,n,e,d;
scanf("%d",&n);
while(n--)
{
scanf("%d%d%d",&a,&b,&c);
e=c*(a+(a-b))/(a+b);
if(e<=0)
printf("0\n");
else
printf("%d\n",e);
}
return 0;
}
#include <math.h>
int main()
{
int a,b,c,n,e,d;
scanf("%d",&n);
while(n--)
{
scanf("%d%d%d",&a,&b,&c);
e=c*(a+(a-b))/(a+b);
if(e<=0)
printf("0\n");
else
printf("%d\n",e);
}
return 0;
}
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