If eleven plus two equals one, what does nine plus five equal?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

A Car driver was heading down a street in Washington. He went right past a stop sign without stopping, he turned left where there was a 'no left turn' sign and he went the wrong way on a one-way street. Then he went on the right side of the road past a cop car. Still, he didn't break any traffic laws. Why not?

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?

Why is 6 afraid of 7?

I look at you, you look at me I raise my right, you raise your left. What am I?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

In the given picture, in how many ways can you read the word "Tiger"?