Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Can you replace the question mark with the correct number?

You have a square. What you have to do is cut and reassemble the square such that you create a Red Cross sign that has the same volume as that of the square.

I am a five-letter word and people eat me. If you remove the first letter I become an energy form. If you remove the first two letters, I am needed to live. Scramble the last three letters and I am a drink. What word am I?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

What is the probability of getting five Mondays in a 31-day month?

Three playing cards in a row. Can you name them with these clues? There is a two to the right of a king. A diamond will be found to the left of a spade. An ace is to the left of a heart. A heart is to the left of a spade. Now, identify all three cards.

Can you solve the maths in the below-given picture equation?

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

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?