Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

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

A Club organizes a Running Race, and John, Jacob, Minda, and Tony participated.

The results are as follows

John beats Jacob
Minda beats Toni
Toni beats John

Who came first in the race?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

I am white when I am dirty, and black when I am clean. What am I?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

In Greek mythology, the Sphinx sat outside of Thebes and asked this riddle of all travellers who passed by. If the traveller failed to solve the riddle, then the Sphinx killed him/her. And if the traveller answered the riddle correctly, then the Sphinx would destroy herself. The riddle:

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Oedipus solved the riddle, and the Sphinx destroyed herself.