I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

Take one out and scratch my head, I am now black but once was red. What am I?

I can write cow in 13 letters.

Can You?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

Why do you find that most of the buildings are deprived of the 13th floor?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

What jumps when it walks and sits when it stands?

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.