Puzzle 197
Astrology begins with the letter A, biology with B.
Can you find an 'ology' that begins with a P and another that begins with an L?
Puzzle Copyright © Kevin Stone
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Hint
One is the study of fossils.
Answer
Palaeontology, the study of fossils and Limnology, the study of lakes and rivers. There are others you might have chosen.
Puzzle 198
Using a tap, a container of 9 litres and a container of 4 litres …
… can you measure 6 litres?
Puzzle Copyright © Kevin Stone
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Hint
Fill the 9-litre container first.
Answer
Here are the contents of the containers after each stage:
A = 9 litres, B = 4 litres
A B
9 0 fill A
5 4 fill B from A (leaving 5 litres in A)
5 0 empty B
1 4 fill B from A (leaving 1 litre in A)
1 0 empty B
0 1 fill B from A
9 1 fill A
6 4 fill B from A (only 3 more litres fit in B)
6 0 empty B
This leaves 6 litres in container A.
Puzzle 199
What number comes next in this sequence:
3 · 3 · 5 · 4 · 4 · 3 · 5 · ?
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Hint
This is a very common sequence.
Answer
5.
The numbers represent the number of letters of the words ONE, TWO, THREE, etc. Therefore, the answer is the number of letters in the word EIGHT.
Puzzle 200
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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