Răspuns :
A + B= 225
A- B = 15 = ? A = B + 15
B + 15 + B = 225
2B = 225 - 15
2 B = 210
B = 210 : 2
B = 105
A - B = 15
A = B + 15
A = 105 + 15
A= 120
A- B = 15 = ? A = B + 15
B + 15 + B = 225
2B = 225 - 15
2 B = 210
B = 210 : 2
B = 105
A - B = 15
A = B + 15
A = 105 + 15
A= 120