Prove that the below maths equation is true.

8 + 8 = 91

Can you make a fire with just a single stick?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

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

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

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

What has no start, end, or centre?

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?