Why is a river so rich ?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different.

How do you measure 45 minutes?

What does this mean?

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You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Can you solve the maths in the below-given picture equation?

Can you count the number of triangles in the given picture?

Find three numbers such that When we multiply three numbers, we will get the prime numbers. The difference between the second and the first number is equal to the third and second.

In a family supper, a grandfather, a grandmother, two fathers, two mothers, four children, three grandchildren, one brother, two sisters, two sons, two daughters, one daughter-in-law, and one mother-in-law need to sit at a table.

There are only seven chairs available at the place. How many more chairs do they have to borrow so that everyone can sit down together for the suppers if everybody requires a separate chair?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Identify the 10 differences between the two given pictures.