A frog is at the bottom of a 30-meter well. Each day he summons enough energy for one 3-meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?

Prove that the below maths equation is true.

8 + 8 = 91

An office is divided into 8 cubicles. How many of the cubicles are painted if only 1/8 of the cubicles are painted?

The dirtier I get, the whiter I look. Who am I?

What is the fastest way to double your money?

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

Jim and Sarah are in a long-distance relationship. Jim buys an engagement ring for Sarah and wants to mail it to her. Unfortunately, the only way to ensure the ring will be received is to place a lock on the package. Jim has locks and Sarah has locks, but neither has keys for each other’s locks. How can they make sure the ring isn’t stolen?

I’m tall when I’m young, and I’m short when I’m old. What am I?