For some weird reason, whenever possible, I try to keep in mind the number of people on the bus.
Keeping up with it is not plain simple, it still takes some concentration/memory.
Let's see how your memory is. Rules are: no paper, no pen, no calculator, no nothing.
Let's go.
I get into the bus, there's 17 people on it.
Bus stops. 1 people get in, 0 people get out.
Bus stops. 2 people get in, 0 people get out.
Bus stops. 3 people get in, 4 people get out.
Bus stops. 3 people get in, 4 people get out.
Bus stops. 2 people get in, 1 people get out.
Bus stops. 4 people get in, 0 people get out.
Bus stops. 1 people get in, 4 people get out.
Bus stops. 1 people get in, 5 people get out.
Bus stops. 4 people get in, 0 people get out.
Bus stops. 1 people get in, 1 people get out.
Bus stops. 3 people get in, 5 people get out.
Bus stops. 4 people get in, 5 people get out.
Bus stops. 2 people get in, 2 people get out.
Bus stops. 3 people get in, 3 people get out.
Bus stops. 2 people get in, 3 people get out.
Bus stops. 3 people get in, 5 people get out.
Bus stops. I get out.
OK, then... so how many times did the bus stop?
