Puzzle 17
What letter comes next in this sequence:
y · y · h · l · y · e · y · t · ?
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Hint
This is a well-known sequence.
Answer
R.
Reasoning
The last letter of September.
y = January
y = February
h = March
l = April
y = May
e = June
y = July
t = August
r = September
Puzzle 18
My local greengrocer is a would-be mathematician.
She likes to arrange the apples in nice rows.
When she lays the apples in rows of 3, she has one left over.
And, when she lays them in rows of 5, she also has one left over.
Remarkably, she also has one left over when she arranges them in rows of 7 and 9.
But 11 seems to be the magic number, because in rows of 11 there are no apples left over.
How many apples does she have?
Puzzle Copyright © Kevin Stone
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Hint
There are fewer than 1,000 apples.
Answer
946 apples.
Reasoning
We know that (answer − 1) is divisible by 3, 5, 7, and 9.
If it's divisible by 9 then it's automatically divisible by 3.
So the number must be a multiple of 5, 7, and 9.
[5 x 7 x 9 = 315]
Since these numbers share no other common factors, we know that the answer must be a multiple of 315 (+ 1).
Let's try 1 x 315 + 1: 316 ÷ 11 = 28.73, and this doesn't work.
Let's try 2 x 315 + 1: 631 ÷ 11 = 57.36, and this doesn't work.
Let's try 3 x 315 + 1: 946 ÷ 11 = 86, and this works, and is the answer.
Puzzle 19
What animal comes next in this sequence:
dog · rooster · monkey · sheep · horse · snake · ?
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Answer
Dragon.
From the Chinese calendar in reverse order.
Puzzle 20
Can you find a valid sentence …
… which has two consecutive ANDs in it?
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Hint
Think of the phrase 'my bucket and spade'.
Answer
In the phrase 'my bucket and your spade', the gap between 'my' and 'and' is the same as the gap between 'and' and 'spade', namely one word.
Indeed, this logic can be continued to give the following sentence. In the first sentence the gap between 'and and' and 'and and' is seven words, et cetera.
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