Complete the table series riddle by finding the number that can replace "??".

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

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

Can you name four days which start with the letter 'T'?

What is the difference between a jeweller and a jailer?

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.

Why do Chinese men eat more rice than Japanese men do ?

What work can one never finish?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).