Henry Ernest Dudeney/Puzzles and Curious Problems/115 - The Eight Cards

by : $115$

 * The Eight Cards
 * Rearrange these cards, moving as few as possible, so that the two columns add up alike.
 * Can it be done?


 * $\begin{array} {} \boxed 1 & \boxed 3 \\ \boxed 2 & \boxed 4 \\ \boxed 7 & \boxed 5 \\ \boxed 9 & \boxed 8 \\ \end{array}$