Have a look at at this diamond – it is made up of 10 triangles.
Your challenges are:
1) 8 triangles**/*****
Move 4 matchsticks and have 8 triangles
2) 7 triangles**/*****
Move 4 matchsticks and have 7 triangles
3) 6 triangles**/*****
Move 4 matchsticks and have 6 triangles
4) 5 triangles**/*****
Move 4 matchsticks and have 5 triangles
You can check your solution here
New puzzles are published at least twice a month on Fridays.
In the past I published several posts on river crossing puzzles. I think together they are the most extensive resource on river crossing puzzles on the web.
I used the week between Christmas and New Year to look for apps. To my surprise, there was just one, and it held just a few puzzles. Well, it did in spire me to:
1) The Autists and the Lazy.
Six people want to cross a river. They have a boat which can hold only 2 people at a time.
* Two of the six people are autists. They don’t want to be in the boat with any one else, though they don’t mind being on the same shore.
* Two of the people are outright lazy, and don’t want to row.
* The remaining two people are normal.
How many crossings does the boat have to make?
You can find the old posts here:
* Man, wife and kids – river crossing 1
* The farmer, the wolf, the goat and the cabbage – 2
* Three couples – river crossing – 3
* Bigamists – river crossing – 4
New brainteasers are published twice a month on Fridays.
You can check your solution here
justpuzzles 