Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

What always comes into a house through the keyhole?

Solve the puzzle by telling what does below picture means.

Mr. Buttons was all set to go to the village of Buttonland to meet his friend. So, he packed his bags and left for the village at 5 in the morning. Upon travelling on a road for miles, he came across a point where the road diverged into two. He was confused on which road to take. He gazed around and he saw two owls sitting on a branch. He thought he could ask for directions for the village from the two owls. So he went to the tree. There he saw a sign which read, "One owl always lies, and one is always truthful. They both fly away if you ask them more than 1 question."
Mr. Buttons was caught in the dilemma of what to ask? And from which owl to ask, since he only had one question. What should Mr. Buttons ask?

What is harder to catch the faster you run?

How many Watermelons are there in the below picture?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Different lights make me strange by changing me into different sizes. What am I?

What is greater than gold but cannot be bought. it can never be sold and can earn if its sought. though it can be broken, it can still be fixed. for by birth it can't start nor by death it is ended.what am i?