Henry Ernest Dudeney/Modern Puzzles/171 - An Irregular Magic Square/Solution

by : $171$

 * An Irregular Magic Square

Solution
Substitute $7$ and $10$ for $2$ and $15$, and we get:


 * $\begin{array}{|c|c|c|c|}

\hline 1 & 10 & 9 & 14 \\ \hline 13 & 10 & 5 & 6 \\ \hline 8 & 3 & 16 & 7 \\ \hline 12 & 11 & 4 & 7 \\ \hline \end{array}$