There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

I have an eye but still cannot see.

Who am I?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

How many bananas can you eat if your stomach is empty?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

Count the number of triangles in the given picture.

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

Can you fill the blank with the correct number?

6 30 870 756030 _____