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Puzzle 1
Add lines to this grid and create five areas that each have 4 letters, to spell five 4-letter words.
Puzzle Copyright © Elliott Line
This puzzle appeared in Mensa's EnigmaSig (195.13) and is used with permission.
Puzzle 2
Using all of the letters A to Z, each once only, complete these common words. There are currently 5 different answers, can you find them all?
-e-el
b-d
s-i-l
swa--
fo-
-er-y
a-ur-
-u-dy
-uo-e
-e-a-e
ed--
sc-r-y
l-p
--lls
Puzzle 3
Which of the shapes are identical to the first one?
Puzzle Copyright © Robert A. Hartmann
Puzzle 4
A Proof That 2 = 1. Let A = B:
A = B
multiply by A on both sides:
A x A = A x B
subtract B x B from both sides:
A x A − B x B = A x B − B x B
factorise:
(A + B)(A − B) = B(A − B)
divide by (A − B) on both sides:
(A + B) = B
replace A with B:
B + B = B
factorise:
2B = B
divide by B on both sides:
2 = 1
Where lies the flaw in the logic?