Place an arrow in each empty square.
Every arrow can either point left or right, but must point to a square with a number.
The numbers indicate the total number of arrows that point at them.
[Ref: ZQZE] © Johan de Ruiter Visit www.puzzlepicnic.com for more Arrow Puzzles.
Direct Link: www.brainbashers.com?ZQZE
Hint: 2 arrows point to the right, and the others point to the left.
The river Pregel runs through the town of Konigsburg. In the river are two islands, connected to each other and the rest of the city by seven bridges.
The students of Konigsburg often challenge each other to try to make a trip crossing all seven bridges exactly once - can you find the path they have to take in order to do this?
Direct Link: www.brainbashers.com?ZTNY
Hint: Try starting in one corner.
Answer: There is no such route.
This is a very famous mathematical problem which was first posed by Euler (pronounced 'oiler').
It was a founding problem in graph theory, an area of mathematics which is very important in modern times, and is used in everything from cryptography to route optimisations.
Last weekend I was given my pocket money, which is meant to last me all week.
On Monday, I spent a quarter of my money on clothes.
On Tuesday, I spent one third of my remaining money on a CD.
On Wednesday I spent half of my remaining money on sweets.
Finally on Thursday I spent my last £1.25 on a comic.
How much pocket money did I receive?
[Ref: ZZJG] © Kevin Stone
Direct Link: www.brainbashers.com?ZZJG
Hint: It might be easier to work backwards.
On Thursday I had £1.25.
On Wednesday I had £1.25 x (1 ÷ one half) = £2.50.
On Tuesday I had £2.50 x (1 ÷ two thirds) = £3.75.
On Monday I had £3.75 x (1 ÷ three quarters) = £5.00.
Which of the six black shapes is/are identical to the red one?
There may be more than one which is exactly the same.
[Ref: ZMZL] © Robert A. Hartmann.
Direct Link: www.brainbashers.com?ZMZL
Hint: Try and rotate them around in your head, and watch out for mirror images.