Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

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

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

Which flower has two lips?

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?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

Three friends named Mr. Black, Mr. Yellow and Mr. Green enter a pub on a weekend night. They are wearing either a Black, Yellow or Green shirt.

Mr. Yellow says to them, 'Did you notice that we all are wearing different color shirts than our names?'

To this, the man who was wearing the Green shirt said. 'Wow, thats right.'

Can you identify who is wearing which colour shirt ?

Solve this riddle by finding the odd one out from the rest.

I can sizzle like bacon,
I am made with an egg,
I have plenty of backbone, but lack a good leg,
I peel layers like onions, but still remain whole,
I can be long, like a flagpole, yet fit in a hole.