Răspuns :
a+b=240
a-30=b+30
a=b+30+30
a=b+60
b+60+b=240
2b+60=240
2b=240-60
2b=180
b=90 lei
a=90+60=150 lei
a-30=b+30
a=b+30+30
a=b+60
b+60+b=240
2b+60=240
2b=240-60
2b=180
b=90 lei
a=90+60=150 lei
240:2= 120
120+30= 150 ( primul)
120-30= 90 ( al doilea)
120+30= 150 ( primul)
120-30= 90 ( al doilea)