Puzzle 5
If I give you seven apples, you will then have five times as many as I would then have.
However, if you give me seven apples, we will then both have the same number of apples.
How many apples do I currently have?
Puzzle Copyright © Kevin Stone
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Hint
A little bit of algebra might help.
Answer
I have 14 apples, and you have 28 apples.
Reasoning
We can work this out with a little algebra. I have A apples, and you have B apples, then
[1] 5 x (A − 7) = B + 7
[2] A + 7 = B − 7
From [1] we have:
5A − 35 = B + 7
[3] 5A = B + 42
From [2] we have:
[4] A + 14 = B
We can then use [4] in [3] to give:
5A = (A + 14) + 42
5A = A + 56
4A = 56
A = 14
Which gives B = 28 (by [4]).
Puzzle 6
I recently gave a new watch to my friend for their birthday.
However, as usual with my presents, it was quite useless as it gains 6 minutes every hour.
I set it using my own accurate clock at midnight, and the watch now shows 8:26am.
I know that it stopped 30 minutes ago, so what is the correct time now?
Puzzle Copyright © Kevin Stone
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Hint
How many watch minutes pass in a real hour?
Answer
8:10am.
Reasoning
The watch now shows 8:26am, so we know that 8 x 60 + 26 = 506 watch minutes have passed.
Since the watch is gaining 6 minutes every hour, for every real hour that has passed, the watch will show 66 minutes.
So, 506 ÷ 66 ≈ 7.666 real hours have passed.
This equals 460 minutes, which is 7 hours and 40 minutes = 7:40am.
The watch stopped 30 minutes ago, therefore the time must now be 8:10am.
Puzzle 7
What is the name of this city?
Puzzle Copyright © Lloyd King
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Hint
Why does each column start with A, B, C?
Answer
Chicago.
Reasoning
Look at the letters at the bottom of each stack.
Puzzle 8
Assign every letter of the alphabet its numerical value: A=1, B=2, C=3, and so on, up to Z=26.
Can you find any common 6-letter words that have a total over 115?
For example, WIZARD = 23 + 9 + 26 + 1 + 18 + 4 = 81.
Puzzle Copyright © Kevin Stone
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Hint
There are many answers, however, Z doesn't appear very often.
Answers
Choose from: luxury, struts, stylus, syrupy, trusts, twisty.
Other less common words include: scuzzy, syrups, syzygy, trouty, trusty, tryout, trysts.