Find the next number in the sequence

5 12 24 36 ?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

I left my campsite and hiked south for 3 miles. Then I turned east and hiked for 3 miles. I then turned north and hiked for 3 miles, at which time I came upon a bear inside my tent eating my food! What colour was the bear?

I can write cow in 13 letters.

Can You?

How can you take 2 from 5 and leave 4?

Can you solve below mathematical equation?

2^1234 - 2^1233

If your uncle’s sister is not your aunt, what relation is she to you?

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

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

What do you answer even though it never asks you questions?