Replace the question mark with the correct number in the below-given picture?

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

What do you answer even though it never asks you questions?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

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

I am lying and I always lie. Tell me whether I am lying or telling the truth.