Find the value of "?" in the ball picture Riddle below:

How many sides does a circle have?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

The Judge knows that Alamgir was killed by his girlfriend Jasline, but the judge is unsure whether to punish her. Why?

In one of the popular batman series movie "Batman Forever", there was a riddle that goes like "Tear me off and then scratch my head and I was red then and now I am back. Who am I?

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

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