Question

Alexandra,Andreea si Adi au inpreuna 1600 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=Andreea, c=Adi
a+b+c=1600
b=200+c
a=b+c
inlocuim a
b+c+b+c=1600
2b+2c=1600
2(b+c)=1600
b+c=800
a+800=1600
a=800 lei are Alexandra
800+200+c+c=1600
1000+2c=1600
c=300 lei are Andreea
b=200+c
b=200+300
b=500 lei are Adi