Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

I have two sand hourglasses:
1. A 7 minute one and
2. An 11-minute one.

Using just these 2 sand hourglasses, how can I measure time as 15 minutes?

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

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

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

What does the below rebus puzzle mean?

A man is shown a portrait painting. He looks closely, then tells, “Brothers and sisters have I none, but that man’s father is my father’s son!” Who is the man in the portrait?

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 ?