John is on an island and there are three crates of fruit that have washed up in front of him. One crate contains only apples. One crate contains only oranges. The other crate contains both apples and oranges.

Each crate is labelled. One reads 'apples', one reads 'oranges', and one reads 'apples and oranges'. He know that NONE of the crates have been labeled correctly - they are all wrong.

If he can only take out and look at just one of the pieces of fruit from just one of the crates, how can he label all of the crates correctly?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal?

Note: 9 cannot be turned over to make it 6.

Count the number of triangles in the given picture.

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

You walk into a creepy house by yourself. There is no electricity, plumbing, or ventilation. Inside you notice 3 doors with numbers on them. Once you open the doors you will die a particular way. Door No.1 You’ll be eaten by a lion who is hungry. Door No.2 You’ll be stabbed to death. Door No.3 There is an electric chair waiting for you. Which door do you pick?

What occurs twice in a week, once in a year but never in a day?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

What has a ring but no finger?

You can hear me, but you can't touch or see me.

What am I?