What question can you never answer yes to?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

The more it dries, the wetter it becomes. Can you tell what it is?

Can you make four (4) nines (9) equal 100?

What makes this number unique: 8,549,176,320?

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.

I have feet, but no legs. Which animal Am I?

The two towns are exactly 100 km apart. John leaves City A driving at 30 km/hr and Jacob leaves City B half an hour later driving at 60 km/hr. Who will be closer to City A when they meet?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?