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

Rectify the following equality 101 - 102 = 1 by moving just one digit.

For an extra income, John decided to work at a Hotel for one hour daily. The manager offers him that they will pay him $11 after every 11 days.
However, John offered a different proposition to the manager. The offers stand as:
He will be paid just a penny on his first day.
Two pence will be paid on the second day,
Four pence will be paid on the third day.
And so on till the 11th day.

Should the Hotel manager accept his offer?

If you drop a 15 kg iron bar and a 5 kg bag of cotton from a height of 50 meters which will reach the ground first?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

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

I guess 76.8% of readers will like this riddle.

What's the least number of people should read this post?

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

I am an odd number. Take away a letter and I become even. What number am I?