Hard riddles

22 and 24: there are two interwoven sequences.
Starting at 19, alternate numbers progress +2, +3, +4, +5.
Starting at 20, alternate numbers progress +2, +4, +6, +8.

Find the next number in the sequence:

2, 3, 6, 9, 36, ?

Answer

41

What goes up the mountain with three legs and comes back with four legs?

Answer

Human being.
A person can use a climbing stick to climb a mountain and he can ride a horse to come back from the hills.

Brain Teaser
A is B's sister.
C is B's mother.
D is C's father.
E is D's mother.
Then, how is D related to D?

Answer

C is B's Mother

That means C is a Mother to A and B

D is C's Father....

That means C is a daughter to D

How is A related to D?

Answer: A is a granddaughter to D while D is a grandfather to A

A B C D E F G H
What letter comes two to the right of the letter which is immediately to the left of the letter that comes three to the right of the letter that comes midway between the letter two to the left of the letter C and the letter immediately to the right of the letter F?

Answer

H

A word I know, six letters it contains, remove one letter and 12 remains.
What is it?

Answer

Dozens