Replace the question mark with the number below given a simple math problem.

Imagine you are in a room with no windows or doors. How will you get out?

There is a hypothetical state between the USA and Mexico border 'Tango'.
Here 70 percent of the population have defective eyesight, 75 percent are hard of hearing, 80 percent have Nose trouble and 85 percent suffer from allergies, what percentage (at a minimum) suffer from all four ailments?

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

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

Which part of London exists in France as well ?

What has 13 hearts but no other organs?

Can you identify the Oscar-winning movie from the rebus below?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?