I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

What Does this text mean:

important=important

Why Aeroplane windows are round?

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?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

In the following series, a set of numbers is progressing with a particular pattern. Can you deduce that pattern and find the missing set?

(2 + 6), (21 + 6), (58 + 6), (119 + 6), ___

You can see three almost identical images below. Can you spot the odd one out from them?

In a mathematical quiz, you are asked the following question:

Use three 9s in a mathematical expression without dividing or multiplying to form the number one.

Can you answer the question?

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?