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

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

John has eleven friends. He has a bowl containing eleven apples. Now He wants to divide the eleven apples among his friends, in such a way that an apple should remain in his bowl.
How can He do it?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

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

What can you see in the middle of March and April that you can never see in any other month?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?