#include <iostream>
using namespace std;
 
int main() {
 
	// your code here
    int n = 0;
    float a, b, c, temp;
 
    scanf("%d", &n);
 
    for (int i=0; i<n; i ++) {
   		scanf("%f %f %f", &a, &b, &c);
   		if(a>b) temp=a,a=b,b=temp;
        if(b>c) temp=b,b=c,c=temp;
        if(a>b) temp=a,a=b,b=temp;
 
        if (b >= 10)
            printf("%.2f\n", (b+c)/2.0);
        else
           printf("Failed\n"); 
    }
 
	return 0;
}

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2
15.75 18 20
5 15 7.5