Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

John and Jill are madly in love with each other. To remind Jill of his pure love, John wants to send her a ring by post but in their country where burglary is quite prominent, any package that is not locked comes under the risk of being stolen for the contents.

John and Jill possess many padlocks but neither one of them has the other key.

Can you find a way John can send the ring to Jill safely?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Be active and find the killer in the picture Riddle below.

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

A man fell off a smuggling boat into deep water. He could not swim and he was not wearing anything to keep him afloat. It took 30 minutes for the people on the boat to realize someone was missing. The missing man was rescued two hours later on the return trip. Why didn't he drown? Note:- He didn't know swimming, the sea was deep, and He wasn't holding anything

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Who is generally closer to the kids, mom or dad?

(it's a funny riddle)