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

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

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

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?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

Can you find out the missing number in the grid?

You can hear me, but you can't touch or see me.

What am I?

Can you place three balls such that the equation shown in the picture holds true?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?