As a child, he was sold online 6 times.
As a teenager, he often got into a lot of trouble.
He eventually went to college to study Physics.
Soon after, he became a cashier.
He later married a slug named Sandra.
Together, they had 23 kids.
He died at the age of 83.
I've completed every puzzle except the tank one, i don't understand the clue. I know it has to do something with half off and the number 15, but what i must do??! :( help please.