Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...

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?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

Find the missing number in the series below

13 -21 34 -55 ? -144

If eleven plus two equals one, what does nine plus five equal?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

I have branches, but no fruit, trunk or leaves. What am I?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?