It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

A boy collects white seashells from the sea and brings them home every night. When he has enough of them, he decides to sell them to a trader.

The trader is ready to buy the shells and he asks the boy about the quantity. At this, the boy starts calculating. He has a giant box that contains 3 mini boxes. Two of them have another mini box inside. If the giant box can hold 50 shells, how many brown shells can he sell to the trader?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

If six children and two dogs were under an umbrella, how come none of them got wet?

You have a 12 liters jug full of water. You have two empty 8 liters and 5 liters jug. How can you divide the water into two equal parts using these jugs?

Can you spot the man between the coffee bean in the picture below ?

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 ?

I am an eight letter word and I am a computer terminology.
The second, third and fourth letters make an animal.
The fourth, fifth, sixth, seventh and eighth letters make a weapon.
The first, second, third and fourth letters can be taken as an outcome of any exam.
The fifth, sixth, seventh and eighth letter combine to form a high end typing software.

Can you tell who am I ?

If a wheel has 54 spokes, how many spaces are there between the spokes?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?