#include <iostream>
#define int long long
using namespace std;
signed main() {
    int n;cin>>n;
    int a, b, c;
    while(n--){
        cin>>a>>b>>c;
        if(b * c % a == 0){
            cout<<b * c / a<<endl;
        }else cout<<-1<<endl;
    }
}
// 64 位输出请用 printf("%lld")