Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

A time long back, there lived a king who ruled the great kingdom of Trojan House. As a part of the renovation of the kingdom to meet future security needs, he asked his chief architect to lay down a new play in a manner that all of his 10 castles are connected through five straight walls and each wall must connect four castles together. He also asked the architect that at least one of his castles should be protected with walls. The architect could not come up with any solution that served all of King's choices, but he suggested the best plan that you can see in the picture below. Can you find a better solution to serve the king's demand?

What 5-letter word typed in all capital letters can be read the same upside down?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

What question can you never answer yes to?

Decode below rebus
D
N
A
T
S , D

Find the Goldfish below the given Image.

You are in a land where thirty men and two women were dressed in classic black and white dresses.
They begin to fight as soon as any of them move.

Where are you?

John was piloting a plane behind a car but was never able to overtake it. Why?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?