2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

There is one four-digit whole number n, such that the last four digits of n2 are the original number n

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?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

What is wrong in the below Picture?

John was piloting a plane behind a car but was never able to overtake it. Why?

During which month do people sleep the least?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

Find The Missing Number In the Sequence.
6 25 64 ? 32 1