#include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
#include<stack>
#include<vector>
using namespace std;
int main()
{
int a,b,c,s,tot=0,ans=0;
cin>>s;
while(s--)
{
cin>>a>>b>>c;
tot=a+b;
ans=0;
while(tot>=c)
{
ans+=tot/c;
tot=tot/c+tot%c;
}
cout<<ans<<"\n";
}
}