Can you convert the number zero(0) into a positive number using just one mathematical operator ?

1 dollar = 100 cent
= 10 cent x 10 cent
= 1/10 dollar x 1/10 dollar
= 1/100 dollar
= 1 cent

=> 1 dollar = 1 cent

solve this tricky problem?

In a family supper, a grandfather, a grandmother, two fathers, two mothers, four children, three grandchildren, one brother, two sisters, two sons, two daughters, one daughter-in-law, and one mother-in-law need to sit at a table.

There are only seven chairs available at the place. How many more chairs do they have to borrow so that everyone can sit down together for the suppers if everybody requires a separate chair?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

Three playing cards in a row. Can you name them with these clues? There is a two to the right of a king. A diamond will be found to the left of a spade. An ace is to the left of a heart. A heart is to the left of a spade. Now, identify all three cards.

What is the next number in the series?

15 29 56 108 208 ?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

Decode below three cipher riddles:

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

What is the word or phrase below?
R | E | A | D

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?