Decode below three cipher riddles:

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

These types of puzzles are known as charades. What you have to do is to find two words that are referred to in the first stanza and the second stanza and put them together to form the third word in the third stanza.

Just for example, if my first refers to 'off' and my second refers to 'ice', then my whole will be the 'office'.

My first is present - future's past -
A time in which your lot is cast.

My second is my first of space
Defining people's present place.

My whole describes a lack of site -
A place without length, breadth, or height.

Find the next number in the series below

21 32 54 87 131 ?

Find the 8 in the below-given Image.

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

What is the next number in this matchsticks series riddle?

Forwards I am heavy, backward I am not. What am I?

I have eight fingers and two thumbs but I do not live. What Am I?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?