why number 8549176320 is one of a kind?

Find the number of squares in the below-given picture.

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

John was a very careless driver, so his owner Jacob gave him an offer that he will get an incentive of Rs.30 for every bottle box he delivered without breaking it and he will be charged Rs.90 for every bottle box he broke. Jacob gave John 100 bottles-box to deliver. After delivery, Jacob paid John Rs.2400. How many bottles-box did John break?

Jessica is telling her friends this story and asks them to guess if it’s the truth or a lie: “There was a man sitting in a house at night that had no lights on at all. There was no lamp, no candle, and no other source of light. Yet, he sat in the house and read his book happily.” Her friends say she’s lying, but Jessica corrects them and says she’s telling the truth. Jessica’s story is true—but how?

What can you see in the middle of March and April that you can never see in any other month?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

What does this rebus riddle means ?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?