Decode below three cipher riddles:

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

Find the next number in the series.
1 10 24 43 67 ?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

I’m tall when I’m young, and I’m short when I’m old. What am I?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

What's a single-digit number with no value?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

ENEMY = 2 * LINK
LINK + 2 = HELL

Then what will be TAXI + HELL? Select from the options below:
a) ROTTEN
b) DANGER
c) HEAVEN
4) MORTAL

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

Two natural numbers have a sum of less than 100 and are greater than one.

John knows the product of the numbers and Jacob knows the sum of numbers.

The following conversation takes place between them:
John: 'I am not aware of those numbers.'
Jacob: 'I knew you wouldn't be. I am not aware myself.'
John: 'Now I know them!'
Jacob: 'Now I know them, too!'

What are the two numbers?