Puzzle 17
What number comes next in the sequence:
11 · 13 · 17 · 31 · 37 · 71 · 73 · 79 · 97 · ?
Puzzle Copyright © Kevin Stone
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Hint
A very tricky puzzle involving prime numbers.
Answer
101.
These are prime numbers, which, when reversed, are also prime.
Puzzle 18
What number comes next in this sequence:
1 · 2 · 2 · 4 · 8 · 11 · 33 · 37 · 148 · ?
Puzzle Copyright © Kevin Stone
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Hint
The sequence involves both adding and multiplying in some way.
Answer
153.
The sequence is created using: +1 x1 +2 x2 +3 x3 +4 x4 +5.
Puzzle 19
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 20
These words have had their vowels (AEIOU) removed, can you replace them to find some animals:
pnd
frrt
s ln
hdghg
chth
tdpl
ttr
plr br
lprd
grff
Puzzle Copyright © Kevin Stone
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Hint
The first word ends with the letter A.
Answers
pnd = panda
frrt = ferret
s ln = sea lion
hdghg = hedgehog
chth = cheetah
tdpl = tadpole
ttr = otter
plr br = polar bear
lprd = leopard
grff = giraffe
