Question

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= adi
a+200=  andreea
a+a+200  alexandra
a+a+200+a+a+200=1600
4a=1600-200-200
4a=1200
a=1200:4
a=300
deci adi =300

a+200=
300+200=
500

deci andreeaare 500

a+200+a=
300+300+200=
800
800 are alexandra
  deci  
         adi=300
    andreea=500
   alexandra800

proba        300+500+800=1600

Answer 2

Notam:
x-Adi, x+200=Andreea, x+x+200=alexandra
1600-(x+x+200+x+x+200)=1200 : 4x=300=x
Adi=300
Andreea=300+200=500
Alexandra=300+500=800