Puzzle 5
Which number, when written as a word, makes this true:
Cleverly, there are exactly ? E's in this sentence.
Puzzle Copyright © Kevin Stone
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Hint
Does ONE work, does TWO work? How many E's are there already?
Answer
Twelve.
"Cleverly, there are exactly twelve E's in this sentence."
Puzzle 6
Can you find a number such that …
… its double is fourteen more than its quarter?
Puzzle Copyright © Kevin Stone
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Hint
The number is less than 20.
Answer
8.
Reasoning
We need a number (N) such that:
2 x N = 14 + N
———
4
Multiply throughout by 4 to give:
8 x N = 56 + N
So:
7 x N = 56
So N = 8.
Double-Checking
Its double is 16.
Its quarter is 2.
So its double is fourteen more than its quarter.
Puzzle 8
If tomorrow's yesterday is today…
…what day is yesterday's tomorrow?
Puzzle Copyright © Kevin Stone
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Hint
Tomorrow's yesterday is always today.
Answer
Today.
Reasoning
Tomorrow's yesterday is always today.
And yesterday's tomorrow is also always today.