#include <iostream>

using namespace std;

int main() {
    int n;
    cin >> n;
    for (int i = 0;i < n;i++) {
        int m1,m2;
        cin >> m1 >> m2;
        while (m1 != m2) {
            if (m1 < m2) {
                m2 /= 2;
            }
            else {
                m1 /= 2;
            }
        }
        cout << m1 * 10 << "\n";
    }
    return 0;
}