Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?

What brings you down but never up?

A man dies of old age on his 25 birthday. How is this possible?

'Ferrari driver' easily beats the 'force driver' in a two-car race. How did Indian newspapers truthfully report so to look as a 'force drive' had outdone the 'Ferrari driver'? Think!!!

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

What is full of holes but still holds water?

Find the value of "?" in the ball picture Riddle below:

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

1. How can we put an elephant in the refrigerator?
2. How can we put a Giraffe in a refrigerator?
3. The king of the jungle invites all the animals to a party everyone comes except for one animal, which animal?
4. You come to a crocodile-infested lake, you can't go around it, you can't co under it and you can't go over it, how do you get across?