What English word has three consecutive double letters?

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?

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

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

Which wheel of car does not rotate when you turn your car right?

In the figure, you can see nine stars. What you have to do is connect all of them by using just four line and without lifting your hand i.e. in a continuous flow.

What is the word or phrase?

How many letters are in the alphabet?

Which is faster, Heat or Cold ? Explain.

What is full of holes but still holds water?

When 99 is considered higher than 100?