Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

There was a strange boy who was born before his father. How can this be possible?

What does below chemistry rebus means?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

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

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?

Jack and Joseph are well-known golf rivals. One Day during a match, they were level at a score of 30. Jack hit a bad shot and Joseph added 10 to his score. Joseph then hit an awesome shot and he won the game.

How ?

What is the next number in this matchsticks series riddle?