t = int(input())
result = []
for _ in range(t):
    n, m = map(int, input().split())
        
    ans = 0

    used = min(n // 4, m // 2)
    ans += 3 * used
    n -= 4 * used
    m -= 2 * used
    
    cnt = n // 10
    ans += 6 * cnt
    n -= 10 * cnt

    if n >= 6:
        ans += 3

    result.append(ans)

for v in result:
    print(v)