Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Can you find the dog hidden in a group of pandas?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

What happened when the wheel was invented?

what does the below rebus mean?

A detective visits his friend John just to discover that John's neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer's name in a code word "Hcqtfz". There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

Decode below rebus
D
N
A
T
S , D

How far can you walk into the woods?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"