Find the number of squares in the below picture

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

Can you count the number of squares in the figure below?

In a school, 280 students studied chemistry, 254 students studied physics and 280 students studied biology.

97 students studied chemistry as well as physics, 138 students studied physics as well as biology and 152 students studied chemistry as well as biology.

73 students studied all the three branches.

Can you find out the total number of students?

Wednesday, Steve and Pam go to a restaurant to eat lunch. After eating lunch, they pay the bill. But Steve and Pam do not pay the bill. So…who does?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different. How do you measure 45 minutes?

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