Can you solve the maths in the below-given picture equation?

What has 88 keys?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

I organized a small get together at my home.
In the party , i have a barrel with some whiskey in it.

Suddenly Guest 1 say 'I bet this barrel of whiskey is more than half full'.
'No, it's less than half full' Guest 2 replied.

I don't have any measuring instrument and without removing whiskey from it , how can i determine which of the guest is right ?

What is more useful when it is broken?

It is always ahead of me yet I can never see it. What is it?

What does this rebus riddle means ?

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?

What does Alexander the Great and Winnie the Pooh have in common?