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

A bank customer had $100 in his account. He then made 6 withdrawals. He kept a record of these withdrawals, and the balance remaining in the account, as follows:

Withdrawals Balance left
$50 $50
$25 $25
$10 $15
$8 $7
$5 $2
$2 $0
----- -----
$100 $99

Why are the Totals not tallying?

A man is trapped in a room. The room has only two possible exits doors. Through the first door there is a room constructed from magnifying glass. The blazing hot sun instantly fries anything or anyone that enters. Through the second door there is a fire-breathing dragon. How does the man escape?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

What common phrase is represented by the below lines

Easy going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Medium going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Tough going:
Weak, 'I can't do it, I'm staying!'
Tough, 'Let's get going.'

Why 1729 is a magic number? Answer Logically.

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

Can you divide the below-given shape into four equal and identical pieces?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

In a chess board, the queen piece can move horizontally, vertically and diagonally freely. The picture represents the same.Can you place 8 queens on the board in a manner that none of the queens can attack each other?