How many times can you subtract the number two from the number fifty?

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?

In a supermarket, there is an intelligent glass pane before a refrigerating unit. This glass pane allows cherries and apples through it but does not allow grapes and Orange to pass through it.

Can you identify the rule that the glass pane is following?

Can you find out who is the kidnapper in below Picture and why, Explain ?

What number should come in place of the question mark below?

A blonde put eyeliner on her head. Why?

Solve the following series:
AZ, GT, MN, __, YB

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?