Decode below three cipher riddles:

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

What does this rebus mean?

O
N
C
E
TIME

John is selling fruits.
He sells grapes at $30, Dates $25, and a Wolfberry $45.
At what price does he sell fig?

PS: Logical Thinking

In a university, a professor gave a set of three problems to the three brilliant students of his class. See the image for the questions.

I am quite hot but become too cold if you remove the first two letters. What am I?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

You are given four tennis balls and asked to arrange those balls in a manner that the distance between each one of them is exactly equal. How will you do it?

Can you move 2 matchsticks to form four equal sized squares.

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What 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?