Why do we preferably have round manhole covers and not square ones?

A few friends are enjoying their sea voyage in a boat full of apples. On the way, they felt hungry and thus decided to eat the apples. Together, they ate two dozen of apples. When they have eaten the apples, will there be any change in the water level?

A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

Which is the rope you never skip with?

I make two people out of one. What am I?

Buy me, smell me or deliver me, I do not change.

Who am I?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

What has a bottom at the top?