Question

Viorel si Dan au 144 lei Clara si Dan au 158 lei iar Viorel si Clara 164 .Ce suma are fiecare ?

Answer 1

v+d=144  ⇒v=144-d
c+d=158  ⇒ c=158-d
v+c=164
Inlocuim v si c in ultima ec: ⇒ 144-d +158 - d =164
302-2dd=164
2d=302-164=138
d=69
v=144-69=75
c=158-69=89

Unde v= Viorel, c=Clara, d=Dan
D=69 lei, V=75 lei, C=89 lei

Answer 2

v+d=144=>v=144-d
c+d=164 => c=164-d
v+c=168

144-d+164-d=168
308-168=2d
140=2d
d=70
c=74
v=94