Manhole Cover

Why are manhole covers round (or circular)?

Ah! Click here to read the solution.

In The Elevator

I’m a security guard in an elevator with two other people. When it reaches the first floor, one person gets out and six get in.

When it reaches the second floor, three people get out and twelve get in.

At the third floor, five leave and nine enter.

It rises to the fourth floor, one person gets on and the doors close.

Suddenly, the elevator cable snaps and the elevator smashes to the ground.

No one survives the fall, yet I’m alive and know exactly how many people go on and off the elevator at every floor.

How is this possible?

Ah! Click here to read the solution.