You need to arrange three 7 and mathematical symbols to form number 1?

Count the number of triangles in the picture below:

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put together.

How old is the man's son ?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

Whats the next number in the below number sequence pattern.

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

A family is trapped in a jungle. There is a bridge which can lead them to safety. But at one time, the bridge can only allow two people to pass through. Also, all of them are afraid of the dark and thus, they can't go alone.

Father takes 1 minute to cross, the mother takes 2 minutes, the son takes 4 and the daughter takes 5 minutes. While crossing the time taken will be according to the slower one. How can they all reach the other side in the minimum possible time?