Notam suma pe care a avut-o fiecare la inceput cu "a"
a-375+a-327+a-340+a-359+a-343=a
5 x a - 375-327-340-359-343=a
5 x a - a = 375+327+340+359+343
4 x a = 1744
a = 1744:4
a=436 - suma avuta la inceput
Se poate face proba:
(436-375)+(436-327)+(436-340)+(436-359)+(436-343) = 61+109+96+77+93 =436