Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Why Aeroplane windows are round?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

In the picture given below, can you find out which digit will take place of the question mark?

An evil man kidnapped someone and made them take one of two pills. One was harmless, but the other was poisonous. Whichever pill the victim took, the kidnapper took the other one. The victim took their pill with water and died. The kidnapper survived. How did the kidnapper get the harmless pill?

Which English verb becomes past tense just by rearranging the letters?

In a rainy season, one day 3 huge ladies walked under a normal-sized umbrella.
The umbrella is not huge enough to accommodate all 3 ladies yet not a single lady got wet. Why?

Which alphabet letter is a question?

On her drawing table, Sayna lit 12 coloured candles. A few seconds later she blew two candles off.

How many candles Sayna have at the end?

What does this Rebus Picture mean?