Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

I’m tall when I’m young, and I’m short when I’m old. What am I?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

The chance of Mr John winning the lottery is 10%. All participants lined up and Mr John is 4th in the row. The first three participants lose the lottery.

What is the chance of Mr John now?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

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.

Can you fill the blank with the correct number?

6 30 870 756030 _____

What is harder to catch the faster you run?

What does this mean?

CCCCCCC

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.