Tricky.
"Hey, Ricky...can you count?"

Ricky.
"Try me."

Tricky.
"Okay...A bus is empty. It's running down Main Street.
On its first stop, it picks up two people."

"The next stop it picks up seven more people.
On it's next stop it lets off three people."

"On its next stop it picks up ten people.
On its next stop it lets off five people."

On its next stop it picks up eight people.
On its next stop it lets off two people."

"Ya got that?"

Ricky.
"Yep."

Tricky.
"How many stops did it make?"