Replace the question mark with the correct number in the below-given picture?

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

The peacock is a bird that does not lay eggs. How do they get baby peacocks?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

Solve the following series:
AZ, GT, MN, __, YB

When it is alive we sing, when it is dead we clap our hands. What is it?

John Went to the nearby store in a Mall to buy something for her home. Below is the conversation between the two:

John: How much for the one?
Shopkeeper: It is $2
John: How much for the Eleven?
Shopkeeper: It is $4
John: How much for the Hundred?
Shopkeeper: It is $6.

What is John buying?

Which Burger Is Different in below image?

All of Jacob's shoes are red except two.
All of Jacob's shoes are green except two.
All of Jacob's shoes are yellow except two.

How many shoes does Jacob have?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?