300
There are 6 people on a bus. At the next stop, half the people get off the bus and 5 more get on. When the bus stops again, no people get off the bus and the total number of people on board triples. If 6 people get off at each of the next stops, and no one gets on, how many more stops will the bus need to make before the bus is empty?
What is 4 stops?