#include <bits/stdc++.h>
using namespace std;
int main()
{
int e,f,t,div,ate,val,c,rem;
scanf("%d",&t);
while(t--)
{
scanf("%d %d %d",&e,&f,&c);
ate=0;
val=e+f;
while(val>=c)
{
div=val/c;
ate+=div;
rem=val%c;
val=div+rem;
}
printf("%d\n",ate);
}
return 0;
}
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