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

Vandaag is het 21 November 2017

Add using:

Planting trees - logic puzzle

Difficulty: 

   Rating: 3.3/5.0

Share this pzzl:  

Somebody would like to have a new garden with 10 trees which have to stand in 5 rows of 4 trees each. How can he or she achieve this?
After the new garden has been layed out, neigbor Sym becomes enthousiastic. He says: "I also would like to have a new garden with trees. But it should have 12 trees which have to be planted in 6 rows of 4 trees each. Furthermore, my garden should be symmetric." How will his garden look like? And can you tell something more about Sym?
trees

Gotta Have It - puzzling puzzle

Difficulty: 

   Rating: 3.3/5.0

Share this pzzl:  

When you don't have it you want it, but when you do have it you want to share it , but you have to keep it. What is it?

Thousand monkeys - math puzzle

Difficulty: 

   Rating: 3.2/5.0

Share this pzzl:  

A very big building in which thousand monkeys are living is lighted by thousand lamps. Every lamp is connected to a unique on/off switch, which are numbered from 1 to 1000. At some moment, all lamps are switched off. But because it is becoming darker, the monkeys would like to switch on the lights. They will do this in the following way.

Monkey 1 presses all switches that are a multiple of 1.
Monkey 2 presses all switches that are a multiple of 2.
Monkey 3 presses all switches that are a multiple of 3.
Monkey 4 presses all switches that are a multiple of 4.
Etc., etc.

How many lamps are switched on after monkey 1000 pressed his switches? And which lamps are switched on?