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

Can you start the fire using two pieces of wood?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

I can be cracked, made, told, and played. What am I?

Which alphabet letter is a question?

The following "Brain Bat" means Slow Down.
S
L
O
W

Using the same logic, can you tell us what does the following Brain Bat means ?
E
V
I
G

Count the number of triangles in the given picture.

Name a key which is hardest to turn.

You are given 2 eggs.
You have access to a 100-storey building.
Eggs can be very hard or very fragile means it may break if dropped from the first floor or may not even break if dropped from 100th floor, Both eggs are identical.
You need to figure out the highest floor of a 100-storey building an egg can be dropped without breaking.
Now the question is how many drops you need to make. You are allowed to break 2 eggs in the process

Which flower has two lips?