Puzzle 17
What comes next in this sequence:
iron · bromine · uranium · argon · ?
Puzzle Copyright © Kevin Stone
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Hint
The chemical symbol for iron is Fe.
Answer
Yttrium.
The element's symbols are spelling February:
iron (Fe) + bromine (Br) + uranium (U) + argon (Ar) + yttrium (Y)
Puzzle 19
Can you fill the thermometers with mercury, such that the numbers outside the grid indicate how many cells in each row and column contain mercury?
Mercury always starts filling from the bottom of a thermometer, and not every thermometer has to contain mercury.
Puzzle Copyright © Johan de Ruiter
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Hint
The top of a thermometer can't be filled unless the bottom is.
Answer
Puzzle 20
Which letter is missing from this sequence:
b · c · e · g · k · q · s · w
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Hint
Convert the letters to positions in the alphabet.
Answer
M.
Reasoning
These are letters that occupy prime number positions in the alphabet:
b = 2
c = 3
e = 5
g = 7
k = 11
m = 13 *
q = 17
s = 19
w = 23
