Thread:Yanagawa1/@comment-35327227-20190508185245/@comment-37745975-20190510120234

K.....

Imagine you are driving a bus...

and there are 5 people on the bus..

on the first stop, 3 people get off, 2 people get on.

on the second stop, 9 people get on, 4 people get off.

on the third stop, 1 person get off, 3 people get on.

on the fourth stop, 4 people get off, 5 people get on.

on the fifth stop, 7 people get on, 3 people get off.

on the sixth stop, 6 people get off, no one get on

on the seventh stop, 10 people get on, 11 people get off.

What's driver's age?