Prove that the below maths equation is true.

8 + 8 = 91

You have a basket containing ten apples. You have ten friends, who each desire an apple. You give each of your friends one apple.
Now all your friends have one apple each, yet there is an apple remaining in the basket.
How?

Suppose we lay down two cups in front of you. One of the cups is filled with tea and the other one with coffee. Now we ask you to take a spoonful of tea and mix it with the coffee. At this moment, the coffee cup has a mixture of tea and coffee. You have to take that mixture (spoonful) and add it back to the tea.

Can you now tell if the cup of coffee has more tea or the cup of tea has more coffee?

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

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

Before Mount Everest was discovered, what was the highest mountain in the world?

What do you call a fish without an eye?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

Why is it against the law for a man living in Delhi to be buried in Mumbai?

What is at the end of a rainbow?