Solve this riddle by finding the odd one out from the rest.

What is the below Rebus indicate?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
----------

A boy collects white seashells from the sea and brings them home every night. When he has enough of them, he decides to sell them to a trader.

The trader is ready to buy the shells and he asks the boy about the quantity. At this, the boy starts calculating. He has a giant box that contains 3 mini boxes. Two of them have another mini box inside. If the giant box can hold 50 shells, how many brown shells can he sell to the trader?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

I am the fastest animal but cannot climb the tree. What am I?

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

Who always enjoys poor health?