#include <iostream>

 #include <cstdio>

 #include <cstring>

 #include <cstdlib>

 #include <cmath>

 #include <algorithm>

 #define LL __int64

 const int maxn = 1e3 + ;

 const int mo = ;

 using namespace std;

 void exgcd(LL a, LL b, LL &d, LL &x, LL &y)

 {

     if(!b) {d = a; x = ; y = ;}

     else{ exgcd(b, a%b, d, y, x); y -= x*(a/b); }

 }

 LL mo_reve(LL a, LL n)

 {

     LL x, y;

     LL d;

     exgcd(a, n, d, x, y);

     if(d==) return (x%n+n)%n;

     else return -;

 }

 int main()

 {

      int t, n, b;

      scanf("%d", &t);

      while(t--)

      {

          scanf("%d%d", &n, &b);

          int x = mo_reve(b, mo);

          printf("%d\n", n*x%mo);

      }

      return ;

 }