One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

Can you find the key in the picture below?

Out of four images which one is the odd one out?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

Two natural numbers have a sum of less than 100 and are greater than one.

John knows the product of the numbers and Jacob knows the sum of numbers.

The following conversation takes place between them:
John: 'I am not aware of those numbers.'
Jacob: 'I knew you wouldn't be. I am not aware myself.'
John: 'Now I know them!'
Jacob: 'Now I know them, too!'

What are the two numbers?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

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

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

There is something which you can be arrested for attempting but not for successfully completing.

I am an odd number. Take away a letter and I become even. What number am I?