primul numar |----------|
al doilea numar |----------|---|+1
al treilea numar |----------|---|---|+2
al patrulea numar |----------|---|---|---|+3
al cincilea numar |--------|-10
a+(a+1)+(a+2)+(a+3)+(a-10)=616
5a+1+2+3-10=616
5a+1+2+3=616+10
5a+1+2=626-3
5a+1=623-2
5a=621-1
a=620:5
a=124