#include<cstdio>
#include<cstring>
#include<algorithm>
#include<cstdlib>
#include<cmath>
#include<vector>
#include<stack>
#include<set>
#include<string>
#include<iostream>
#include<map>
#pragma comment(linker,"/STACK:102400000,102400000") 
using namespace std;
int a[10005],b[10005];
double sum,vsum,vleft,vright,mid;
int main(){
    int i,j,n,m,t,T;
    scanf("%d",&T);
    while(T--){
        scanf("%d",&n);
        for(i=1;i<=n;i++){
            scanf("%d",&a[i]);
        }
        for(i=1;i<=n;i++){
            scanf("%d",&b[i]);
        }
        sum=0;
        for(i=1;i<=n;i++){
            sum+=1.0*a[i]*b[i]*b[i]/3;
        }
        vleft=0;vright=1000;
        while(vright-vleft>0.01){
            mid=(vleft+vright)/2;
            vsum=0;
            for(i=1;i<=n;i++){
                if(mid<a[i]){
                    double x=b[i]*(a[i]-mid)/a[i];
                    vsum+=x*x*(a[i]-mid)/3;
                }
            }
            if(vsum>=sum/2) vleft=mid;
            else vright=mid;
        }
        __int64 ans=vleft;
        printf("%I64d\n",ans);
    }
    //system("pause");
    return 0;
}