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?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

On a bright sunny day, two fathers took their son fishing in the lake. Each man and son were able to catch one fish. When they returned to their camp, there were only three fishes in the basket. What happened?

PS: None of the fish were eaten, lost, or thrown back.

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?