81 x 9 = 801. What must you do to make the this equation true?

There is a place where if I stand up straight, I will still be considered sideways.

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Find the missing letter in the last circle logically in the given below picture.

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

You order chicken wings at KFC in the boxes of 6, 9 and 20. What is the largest number of wings that you cannot obtain by buying in any combination of the boxes?

Name a key which is hardest to turn.

By what process could you make a 'Tea-Table' into food?

What part of Turkey has the most feathers?