#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<algorithm>

#define ll long long
#define inf 1e9
#define eps 1e-10
#define md
#define N 10010
using namespace std;
double h[N],v[N];
inline double P  (double x) { return x*x*x;}
int main()
{
    int tt,n;
    scanf("%d",&tt);
    while (tt--)
    {
        scanf("%d",&n);
        double sum=0,x;
        for (int i=1;i<=n;i++) scanf("%lf",&h[i]);
        for (int i=1;i<=n;i++)
        {
            scanf("%lf",&x);
            v[i]=(1.0/3)*h[i]*(x*x);
            sum+=v[i];
        }
        int l=0,r=1000;
        while (l!=r)
        {
            int mid=(l+r+1)/2; double S=0;
            for (int i=1;i<=n;i++)
            {
                double der=(h[i]-mid);
                if (der<0) continue;
                S+=P(der/h[i])*v[i];
            }
            if (S*2>sum) l=mid; else r=mid-1;
        }
        //printf("%lf\n",l);
        printf("%d\n",l);
    }
    return 0;
}