1079.py

N = int(input())

for data in range(N):

    split_input = input().split()

    data1 = float(split_input[0])
    data2 = float(split_input[1])
    data3 = float(split_input[2])

    average = ((data1 * 2) + (data2 * 3) + (data3 * 5)) / 10
    print("%.1f" % average)