Replace the question mark with the correct number in the below-given picture?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

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

You have an empty wine bottle with a cork that has been secured at the top in a normal way. There is a metal ring inside the bottle that is suspended by a string.

How can you make the metal ring drop to the bottom if you are not allowed to touch anything - not the bottle, not the cork, not the thread and not the ring?

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.

John and Jill are madly in love with each other. To remind Jill of his pure love, John wants to send her a ring by post but in their country where burglary is quite prominent, any package that is not locked comes under the risk of being stolen for the contents.

John and Jill possess many padlocks but neither one of them has the other key.

Can you find a way John can send the ring to Jill safely?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

I cannot talk, but I always reply when spoken to. What am I?

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

What is harder to catch the faster you run?