Răspuns :
a + b + c = 375
a + b = 205 => c = 375 - 205 = 170
b = c/5 => b = 170/5 = 34
a + b = 205 => a = 205 - 34 = 171
a + b + c = 375
a + b = 205
205 + c = 375
c = 375 - 205
c = 170
______
b = c : 5
b = 170 : 5
b = 34
_____
a = 375 - ( 34 + 170)
a = 375 - 204
a = 171
_______
V. 171 + 34 + 170 = 375
a + b = 205
205 + c = 375
c = 375 - 205
c = 170
______
b = c : 5
b = 170 : 5
b = 34
_____
a = 375 - ( 34 + 170)
a = 375 - 204
a = 171
_______
V. 171 + 34 + 170 = 375