In a concert, Christina is performing a dance show with her group.
At 10:00, she and her crew were dancing in an absolutely straight line. At that time Christina was standing in 4th position from both the front and back end of the row.

What was the size of her crew?

I guess 76.8% of readers will like this riddle.

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

Can you find out which number multiplied by itself will give the output as 12345678987654321?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

There is a certain crime, that if it is attempted, is punishable, but if it is committed, is not punishable. What is the crime?

What has one eye, but can’t see?

If one and a half boys, eat one and a half burgers in one and a half hours.

How many burgers can 9 boys eat in 3 hours?

Can you place six X (crosses) in below board without making three in a row in any way ?

I am white when I am dirty, and black when I am clean. What am I?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?