Can you replace the question mark with the correct number?

Can you tell a 3D object that has just two surfaces?

what's the probability of getting a king or a queen from a pack of 52 cards?

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

John, a 5-year-old boy, was really fond of the chocolates. He asked his Mother to give him some money to buy his favourite chocolates. His Mother gave him $45. He went to the shopkeeper and asked, "How much is one chocolate for?". The shopkeeper said $3 for one chocolate. Also, if you give me the wrappers of three chocolates, I will give you one for the exchange.
In total, how much chocolate could John eat?

What am I?

First, think of the colour of clouds. Next think the colour of snow. Last, think of the colour of the moon. Now, what do cows drink?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

Steffi's daughter Jazelle needs to be picked up from school every day.
Steffi asks one of her colleagues to pick up Jazelle from the school. Steffi devised a password system to confirm that Jazelle goes with the correct colleague only.

The password on Monday was SJM16.
The password on Wednesday was TAW39.

What will the password be for Friday?

Which is heavier: a ton of bricks or a ton of feathers?