536 Puzzles and Curious Problems

(Elliott) #1

272 Answers


The general solution depends on the fact that every prime number of the
form 4m + I is the sum of two squares. Readers will probably like to work out
the solution in full.



  1. ELEMENTARY ARITHMETIC


The answer must be 273. It is merely a sum in simple proportion: If 5 be 4,
then 3Yl will be 273.


  1. TRANSFERRING THE FIGURES


The required number is:

2,173,913,043,478,260,869,565,

which may be multiplied by 4 and the product divided by 5 by simply moving
the 2 from the beginning to the end.



  1. A QUEER ADDITION


Write the following four numbers, composed of five odd figures, in the form
of an addition sum, II, I, I, I, and they will add up to 14.



  1. SIX SIMPLE QUESTIONS


(I) 8, II I Y.J; (2) 1873; (3) 7 and I; (4) 1\-3; (5) 8\4; (6) %.


  1. THE THREE DROVERS


Jack had II animals, Jim 7, and Dan 21 animals, making 39 animals in all.


  1. PROPORTIONAL REPRESENTATION


The number of different ways in which the ballot may be marked is 9,864,100.


  1. A QUESTION OF CUBES


The cubes of 14, 15, up to 25 inclusive (twelve in all) add up to 97,344, which
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