Puzzle 1
What is the minimum number of queens required on a chessboard such that all squares are attacked?
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Hint
Try this with a real board.
Answer
5 queens are required.
Puzzle 2
Each of these words has had its vowels (AEIOU) removed.
Can you re-add the vowels and find the related words?
cbbg
clflwr
ccmbr
crgtt
crrt
clrc
Puzzle Copyright © Kevin Stone
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Hint
The words are all vegetables.
Answers
cbbg = cabbage
clflwr = cauliflower
ccmbr = cucumber
crgtt = courgette
crrt = carrot
clrc = celeriac
Puzzle 3
How many times can you take 7 away from 49?
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Hint
This is a trick question.
Answer
Once.
After which you will be taking 7 from 42!
Puzzle 4
I started out on the journey from the forest with a full tank of fuel, 12 gallons exactly.
However, the moment I started out, the fuel tank sprung a leak. I travelled at 50 mph until I ran out of fuel exactly 4 hours later.
I know that the car does 25 miles for each gallon.
How much fuel had I lost through the hole?
Puzzle Copyright © Kevin Stone
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Hint
How many miles did I travel?
Answer
I had lost 4 gallons.
Reasoning
I travelled at 50mph for 4 hours, which is 200 miles.
I used 25 gallons every 25 miles, so I used 8 gallons travelling those 200 miles.
I started with 12 gallons and used 8 gallons, so I lost the other 4 gallons.