Puzzle 13
In this sequence of planets, can you work out why they are listed in this order?
Jupiter, Saturn, Uranus, Neptune, Earth, Mars, Mercury, Venus.
Puzzle Copyright © Kevin Stone
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Hint
The answer is something to do with time.
Answer
The order is based on the length of day of the planet in Earth hours and days.
Jupiter has the shortest day (≈ 9 Earth hours), and Venus has the longest day (≈ 243 Earth days).
Puzzle 14
What letter is missing from this sequence:
A · B · G · D · E · ? · E
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Hint
This is quite a common alphabet.
Answer
Z.
From Zeta, first letters of the Greek alphabet, alpha, beta, gamma, delta, epsilon, zeta, eta.
Puzzle 15
Can you find the country hidden in the following sentence:
I really fear lions and tigers, but the animal I fear most though is the mouse.
Puzzle Copyright © Kevin Stone
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Hint
The country spans more than one word.
Answer
Mali.
I really fear lions and tigers, but the aniMAL I fear most though is the mouse.
Puzzle 16
If I buy a melon and a coconut, the cost will be £1.19.
If I buy a melon and a pineapple, the cost will be £1.45.
If I buy a coconut and a pineapple, the cost will be £1.40.
What are the individual prices?
Puzzle Copyright © Kevin Stone
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Hint
A little algebra might help.
Answer
Pineapple = 83p, coconut = 57p, melon = 62p.
Reasoning
If we assign the letters P, C and M to the fruits, and work in pence we have:
(1) M + C = 119
(2) M + P = 145
(3) C + P = 140
Using (2) − (1) we have:
(4) P − C = 26
And (3) + (4) gives:
2P = 166
P = 83
This can then be substituted back into (2) and (3).
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