When can we add 2 to 11 and get 1 as the correct answer?

A pack of cards has 40 cards. You are blindfolded. Out of 40, 25 cards are facing down while 15 are facing up. You have been asked to divide this pack of cards into two decks - so that each deck contains an equal number of face-up cards. Remember, you are blindfolded.

How will you do it?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

Can you make four (4) nines (9) equal 100?

In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.

A mathematician couple was having a Frappuccino in Starbucks sitting opposite to each other. Suddenly the guy noticed the text written on the paper in front of them and exclaimed that it was wrong. The girl denied it and said it is appropriate. Both are correct. What is written on the paper?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

What does the below rebus riddle means?

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

You need to arrange three 7 and mathematical symbols to form number 1?