Logic puzzles, riddles, math puzzles and brainteasers - pzzls.com

Vandaag is het 20 June 2018

Add using:

2 x 2 = 2 + 2 - math puzzle

Difficulty: 

   Rating: 2.9/5.0

Share this pzzl:  

Two times two is equal to two and two. But are there more number pairs for which the sum of the numbers is is equal to the product of the numbers? The numbers may be different. black board

Chess-board - math puzzle

Difficulty: 

   Rating: 3.0/5.0

Share this pzzl:  

How many different squares are located on a chess-board?
chessboard

The swamp - math puzzle

Difficulty: 

   Rating: 3.0/5.0

Share this pzzl:  

A rich earl has become the owner of a piece of land, which to his dissatisfaction turned out to be nothing more than a big swamp. The earl wants to get rid of the swamp. A salesman advises him to use his fast-growing plants which can cover the swamp very quickly. "This plant doubles every day, tomorrow you will have two, the day after tomorrow four, etc. In 80 days, your swamp will be completely covered." The earl reacts: "80 days? This takes far too much time. Then just give me eight of these plants."

Question 1: What did the earl think?
Question 2: And what do you think?