Puzzle 1
Sam takes 20 days to build a wall.
Taylor and Kelly each take 10 days to build a wall.
How long will it take the three of them to build a wall if they work together?
Puzzle Copyright © Kevin Stone
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Hint
How many walls can be built in 20 days?
Answer
4 days.
Reasoning
In 20 days, Sam can build 1 wall, and Taylor and Kelly can each build 2 walls.
So, in 20 days, 5 walls can be built.
Therefore, one wall will take 4 days to build.
Puzzle 2
If cat and a half can catch a mouse and a half in a day and a half how many mice can 3 cats catch in 3 days?
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Hint
How many mice does one cat catch?
Answer
Six mice.
1.5 cats catch 1.5 mice in 1.5 days.
so
1 cat catches 1 mouse in 1.5 days.
1 cat catches 2 mice in 3 days.
Therefore
3 cats catch 6 mice in 3 days.
Puzzle 3
By changing the second letter of each of the words below, can you make another valid word?
You have to change each word such that the second letters will reveal a ten-letter word when read downwards.
Therefore, what now reads 'craihruane' will be a real word.
icon
crew
farm
oily
chop
arid
fund
wait
gnat
tear
Puzzle Copyright © Kevin Stone
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Hint
The 9th word is GOAT.
Answers
Rhinoceros.
iron
chew
firm
only
coop
acid
fend
writ
goat
tsar
Puzzle 4
What always weighs the same …
… no matter how large it is?
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Hint
There are at least 4 answers that fit the question.
Answer
A hole or a vacuum, or perhaps a set of scales, or maybe a shadow.