Can you place three balls such that the equation shown in the picture holds true?

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?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

How can you make number one disappear by adding something to it?

I have teeth but i don't bite. Who Am I ?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

You along with your friend are standing in front of two houses. Each of those houses inhabits a family with two children.

Your friend tells you the below two facts:
1) On your left is a family that has a boy who likes accounts but the other child loves science.
2) On the right is a family with a seven-year-old boy and a newborn baby.

You ask him, "Does either of the family have a girl?"

To this, he replies, "I am not quite sure. But can you guess that? If you are right, I will give you $500."

Which family do you think is likely to have a girl?

A bomb exploded in a room full of married couples and no one died. How?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'