The centre of the third figure is empty. What digit should fit inside?

Can you fill the blank with the correct number?

6 30 870 756030 _____

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

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

In the four images below, can you find the odd one out?

Why do you find that most of the buildings are deprived of the 13th floor?

Can you find out the total number of triangles in the given figure?

You walk into a room where there are three primates held in their respective cages:
1) A lion who is eating the flesh of a goat.
2) An orangutan who is playing with blocks.
3) A donkey who is sitting idle.

Who is the most intelligent primate in the room?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?