13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

Find out the missing number in the picture attached:

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

In the image given, you can find several triangles. Can you count them all?

Given below is simple addition with a defined pattern pattern:
7 + 7 = 2
8 + 8 = 4
8 + 5 = 1
6 + 9 = 3
10 + 11 = 9

Can you analyze the pattern and find out the answer for:

4 + 9 = ?

How is a fly different from a mosquito?

Which Burger Is Different in below image?

Can you find out the remainder when 3^300 is divided by 5?

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

A woman lives in a skyscraper thirty-six floors high and is served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?