Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

What kind of band never plays music?

What has a ring but no finger?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

Which is the correct shadow of the bird?

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

Can you find out who is the kidnapper in below Picture and why, Explain ?