#include <stdio.h>
#include <math.h>

const double pi = 3.14159;
const double eps = 1e-8;

int main(void)
{
  int n, i, j;
  int f[3], r[9], c, t;
  double target;
  int best_f, best_r;

  scanf("%d", &n);
  while (n-- > 0) {
    for (i = 0; i < 3; i++) {
      scanf("%d", f+i);
    }
    for (i = 0; i < 9; i++) {
      scanf("%d", r+i);
    }
    scanf("%d %d", &c, &t);
    target = t / (c * pi);

    best_f = best_r = 0;
    for (i = 0; i < 3; i++) {      
      for (j = 0; j < 9; j++) {
	if (fabs((double)f[i]/r[j] - target) + eps < 
	    fabs((double)f[best_f]/r[best_r] - target)) {
	  best_f = i;
	  best_r = j;
	}
      }
    }

    printf("A gear selection of %d/%d produces a gear size of %.3f.\n",
	   f[best_f], r[best_r], (double)f[best_f]/r[best_r] * c * pi);
    if (n) {
      printf("\n");
    }
  }
  return 0;
}