Which does not belong?

LOVE
ZILCH
GOOSE EGG
EPISODE
NIL
DUCK

What comes next?

0, 15, 30, 40, __

In a far-off kingdom, it is well known that the only way to counteract being poisoned is to drink a stronger poison, in order to neutralize the weaker one. Long ago, the king who ruled this kingdom wanted to ensure that he possessed the strongest poison in the kingdom, to ensure that he could counteract any attempts on his life.

So the king called the royal treasurer and the kingdom's best pharmacist. He gave each the task of concocting the...

After recent events, Question Mark is annoyed with his brother, Skid Mark. Skid thought it would be funny to hide Question's wallet. He told Question that he would get it back if he finds it. So, first off, Skid laid five colored keys in a row. One of them is a key to a room where Skid is hiding Question's wallet. Using the clues, can you determine the order of the keys and which is the right key?

Red: This key is somewhere to the left of the...