81 x 9 = 801. What must you do to make the this equation true?

What is both possible and impossible at the same time?

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?

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

Can you solve the below geography rebus by decoding the below rebus ?

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

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

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

There are three boxes which are labeled as Rs100, Rs150, and Rs200. One box contains two notes of Rs. 50. The second box contains one note of Rs50 and one note of Rs100 The third box contains two Rs. 100 notes. All boxes are labeled incorrectly.

What is the minimum number of boxes you must check in order to label all boxes correctly?