Question

AM NEVOIE DE AJUTOOR!!VA ROOG!!



Alexandra, Andreea si Adi au impreuna 1600 de lei. Calculati ce suma are fiecare daca Andreea are cu 200 de lei mai mult
decat Adi, iar Alexandra are cat Andreea si Adi la un loc.

Answer 1

a=Alexandra
b=Adi
c=Andreea
c=b+200
a=b+c=b+b+200=2b+200
2b+200+b+b+200=1600
4b=1200
b=300 lei Adi
c=300+200=500 lei Andreea
a=2*300+200=800 lei Alexandra

Answer 2

al+an+ad=1600[lei];
⇒an=200+ad;
⇒al=an+ad;⇒al=200+ad+ad;
⇒200+2ad+200+ad+ad=1600
⇒4ad+400=1600⇒4ad=1200⇒ad=300[lei-Adi];
⇒an=200+300
⇒an=500[lei-Andreea];
⇒al=200+2·300
⇒al=200+600
⇒al=800[lei-Alexandra];