Răspuns :
a+ 3a+24 = 1240
4a= 1216
a= 304
b= 3x 304 + 24
b= 912+24
b= 936
4a= 1216
a= 304
b= 3x 304 + 24
b= 912+24
b= 936
a+b=1240
b=3a+24
a+3a+24=1240
4a=1240-24
4a=1216
a=304
b=3x304+24
b=936
Verificare : 304+936=1240
b=3a+24
a+3a+24=1240
4a=1240-24
4a=1216
a=304
b=3x304+24
b=936
Verificare : 304+936=1240