Răspuns :
s = suma initiala
s - s × 4/5 = 25 | *5
adica 5s - 4 s = 5×25 ⇒ s = 125 (lei)
V... 125 - 125×4 : 5 = 25 (A)
s - s × 4/5 = 25 | *5
adica 5s - 4 s = 5×25 ⇒ s = 125 (lei)
V... 125 - 125×4 : 5 = 25 (A)