Why did the Girl throw the butter out of the window?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

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

How Come ??

A frog is at the bottom of a 30-meter well. Each day he summons enough energy for one 3-meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?

A man embarked on a questionnaire game. He kept asking the same question to whomever he found. The answer each time was different.

Can you guess what the question was?

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

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Can you name some countries which do not have the alphabet 'A' in them?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?