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 ?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Can you spot the man between the coffee bean in the picture below ?

If Japan and Panama decided to merge into a single country, probably people will name it Japanama.

Can you think of two more such country's unions that could produce similar names like Japanama by overlapping their three letters?

Can you find the least possible number such that

If the number is divided by 3, it gives the remainder of 1;
If the number is divided by 4, it gives the remainder of 2;
If the number is divided by 5, it gives the remainder of 3;
If the number is divided by 6, it gives the remainder of 4.

Before Mount Everest was discovered, what was the highest mountain in the world?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Count the squares in the matchstick puzzle below?