Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?

What has 13 hearts but no other organs?

Use the digits from 1 up to 9 and make 100.

Follow the rules.
=> Each digit should be used only once.
=> You can only use addition.
=> For making a number, two single digits can be combined (for example, 4 and 2 can be combined to form 42 or 24)
=> A fraction can also be made by combining the two single digits (for example, 4 and 2 can be combined to form 4/2 or 2/4)

Question: how can we do this?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

What do you think with the below Picture ?