1 A Difficult Question

Four girls went to school every day by taxi.

One day one of the girls said,“There's a test this morning. Let's get to school late. Then we won't have to take the test.”

“What can we tell the teacher? ” one of the girls said. “He'll be angry.We'll need a good excuse.”

The girls thought for several moments, then one of them said,“Let's tell him that our taxi had a flat tire.”

“That's a good idea, ” the other girls said. “We'll tell him that.”

They arrived at school an hour later.The test was finished.

“Why are you late? ” the teacher asked. “You missed the test.”

“Our taxi had a flat tire, ” one of the girls said.

The teacher thought for a moment, then he said, “Sit down, one of you in each corner of the room.”

The four girls did this.

Then the teacher said, “Write the answer to this question on a piece of paper: Which tire was flat? ”