I have an apple tree , number of apple in this tree get doubles every week.

On 30th week , the tree gets completely filled with apples :-)



Can you tell me , on what week does my tree is half covered with apples ?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Can it be possible to build a house that has all its four walls facing towards the South?

A man was driving a black truck. His lights were not on. The moon was not out. A lady was crossing the street. How did the man see her?

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 is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

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

AB * C = DE - F = GH / I

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

Solve this riddle by finding the odd one out from the rest.