(I) E * K = BE + * : (II) B : N = N ---------------- (III) DN + DN = NB (IV) (V) (VI) Solution: The letters can be reconstructed in a simple way. (IV) D = 1 (III) 2D <= N <= 2D+1 => 2<=N<=3 (III.2) N = 2D = 2 as 2N <= 6 there is no carry (III.1) B = 2N = 4 Now the two rows (II) and (III) are solved. The rest is easy. 8 * 6 = 48 + * : 4 : 2 = 2 ---------------- 12 + 12 = 24 References: Walter Lietzmann; Lustiges und Merkw\"urdiges von Zahlen und Formen, Verlag Vandenhoeck & Ruprecht, G\"ottingen 1955, 8. Auflage, ISBN 3-525-39112-9 Chap II.5: Vergilbte Manuskripte (p128-131, 21 problems) Chap II.13: Anagramme, Kryptogramme, Geheimschriften und dergleichen (p191-192, 10 problems)