Puzzle 5
I have a jar of sweets.
There are 234 red, 26 blue, 67 green and 63 yellow sweets.
What chance do I have of picking a blue one with my eyes shut?
Puzzle Copyright © Kevin Stone
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Hint
How many sweets in total are there?
Answer
1 in 15.
Reasoning
In total, there are 390 sweets in the jar, and 26 of them are blue.
So the chance of picking blue is 26 in 390 = 1 in 15 = 6.66%.
Puzzle 6
Which one of these letters is the odd one out?
Puzzle Copyright © Kevin Stone
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Hint
These are all Greek letters.
Answer
θ (theta).
Reasoning
These are all Greek letters, and they are:
xi, chi, theta, psi, pi, phi
They all sound similar to each other, except θ.
Puzzle 7
What is the 10th prime number?
2, 3, 5, 7, …
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Hint
2, 3, 5, 7, 11, 13, 17, 19, 23, …
Answer
29.
The first ten prime numbers are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29.
Puzzle 8
I was having trouble sleeping last night and I tossed and turned well into the night.
Our local town hall has a clock which strikes on the hour and also strikes just once on the half hour.
During one of my more awake moments I heard the clock strike once, but I could not tell what time it was.
Half an hour later it struck once again, but I still could not tell what time it was.
Finally, half an hour later it struck once again and I knew what the time was.
What time was it?
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Hint
When does the clock strike just once?
Answer
1.30 in the morning.
The initial single strike was at 12.30.
