How many triangles can you find in this given picture?

There is a barrel with no lid and some wine in it. 'This barrel of wine is more than half full,' said Curly. 'No it's not,' says Mo. 'It's less than half full.' Without any measuring implements and without removing any wine from the barrel, how can they easily determine who is correct?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

After undergoing a successful eye operation, A blind girl has just boarded a train to her home. The doctor asked her to open the bandages after 3 hours. On her train journey, she opened the bandages and within a fraction of the time she commits suicide by jumping off the train.

Though her operation was successful, Why did she commit suicide?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

A journalist was investigating a sacred cult in the jungles of Africa when he was caught by one of the person. He was confined in a cave till the leader arrived. The leader told him that he need to tell him a statement. If he thinks the statement is true, then the journalist head will be chopped off. If he thinks that the statement is false, his head will be smashed with a hammer.

What statement did the journalist make to survive?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

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?

Rearrange the letters in "new door" to make one word.