1分钟=60秒,
(60÷3×5-6)÷5×100÷(60÷3),
=(20×5-6)÷5×100÷20,
=94÷5×100÷20,
=18.8×100÷20,
=1880÷20,
=94(道),
答:李明已做完94道,
故答案为:94.