I shave every day, but my beard stays the same. What am I?

What always comes into a house through the keyhole?

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

How many times can you subtract the number two from the number fifty?

If I put in one bird per cage, I have one bird too many. If I put in two bird per cage, I have one cage too many. How many cages and birds do I have?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

How do you go from 98 to 720 using just one letter?

In an interview, a boy was asked an unusual question 'How two persons sitting with a table in between them can't see each other?' He was unable to reply. Can you?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _