What always comes into a house through the keyhole?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

In a basket of apples,
when counted in twos, there was one extra
when counted in threes, there were two extra when counted in fours, there were three extra
when counted in fives, there were four extra
when counted in sixes, there was five extra.

However, if the apples were counted in sevens, no extra apple was left. Can you calculate the minimum number of apples that were present in the basket?

1 dollar = 100 cent
= 10 cent x 10 cent
= 1/10 dollar x 1/10 dollar
= 1/100 dollar
= 1 cent

=> 1 dollar = 1 cent

solve this tricky problem?

What is wrong in the below Picture?

I know a nine-letter word having only one vowel.
Do you ?

John was drowned by he was not wet. How?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

What's the only room from which no one can enter or leave

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?