Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

John was piloting a plane behind a car but was never able to overtake it. Why?

While house hunting in London, I came across a very good leasehold property Discussing the lease the landlady told me:

'The property was originally on a 99 years lease and two-thirds of the time passed is equal to four-fifths of the time to come. Now work it out for yourself and see how many years are to go!

There is a certain crime, that if it is attempted, is punishable, but if it is committed, is not punishable. What is the crime?

The centre of the third figure is empty. What digit should fit inside?

Give it food and it will live; give it water and it will die.

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

How many words can a pen with half refill write?

Name the three-letter word that can complete the below words?

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

A boy purchased a book from a bookkeeper and gave him $100.
The cost of the book is $50 but the bookkeeper has no change, so he gets the change from the next shop and returns the boy his $50.

After some time the next shopkeeper came with the $100 note and told the bookkeeper that the note was a fraud, so he took the money back.

How much loss did the bookkeeper face?