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Puzzle 6
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?
Puzzle 7
By changing the second letter of each word below, you can make another valid word.
Can you change each word such that the second letters will reveal an eleven-letter word when read downwards?
Therefore, what now reads 'vokahliuppw' will become a real word.
oval
post
skin
malt
when
slab
miss
fund
aped
sped
sway
Puzzle 8
What number comes next in this sequence:
302 · 202 · 102 · 002 · 991 · ?