Puzzle 5
At the equator the radius of the earth is 6,378 km, so its circumference is almost exactly 40,000 km.
Imagine we had a long rope which went around the equator, this would of course be 40,000 km long.
If we now placed 1-metre sticks vertically all the way around and lay the rope on top of these sticks (so the rope would be 1m higher all the way around) how much extra rope would we require?
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Hint
Circumference = 2 x Radius x π .
Answer
6.28 metres, a lot less than you might think!
If we call the radius of the Earth R, then the difference between the two circumferences is:
2 x π x (R + 1) − 2 x π x R
= 2 x π metres
= 6.28 metres.
Puzzle 6
James, Simon, Ian, and William all like walking.
But Dave, Steven, Alan, and Alastair do not.
Does Adrian?
Puzzle Copyright © Kevin Stone
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Hint
Look at the number of letters in each of the names.
Answer
No.
Those that like walking have an odd number of letters in their name.
Puzzle 7
Can you find anagrams of the following words?
aspirate
alarming
bleating
decimate
creative
cheating
download
gradient
altitude
generate
Puzzle Copyright © Kevin Stone
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Hints
The first letters of the words are: P, M, T, M, R, T, W, T, L, T.
Answers
parasite
marginal
tangible
medicate
reactive
teaching
woodland
treading
latitude
teenager
Puzzle 8
The following sentence is true.
The previous sentence is false.
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Hint
Don't let this one melt your brain.
Answer
This puzzle is a classic paradox.
You can wrangle with the logic for hours and never reach an absolute conclusion.
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