Question

trei frati au impreuna 3600 lei .Primul are de doua ori mai mult lei decat
al doilea iar al treilea cu 1500 lei mai putini decat primul . cati lei are fiecare

Answer 1

x+2x+2x-1500=3600
5x-1500=3600
5x=3600+1500
5x=5100
x=5100:5
x=1020 lei (al doilea)
2x=1020 lei x2⇒2x=2040 lei (primul)
2x-1500=2040-1500⇒2x-1500=540 lei (al treilea)

Answer 2

A+B+C=3600
A=2B  B=A/2
C=A-1500
A+A/2+A-1500=3600   NMC=2
(2A+A+2A)/2=3600+1500
5A/2=5100
  A=5100X2/5=2040
A=2B     B=A/2=2040/2=1020  
C=A-1500=2040-1500=540
A+B+C=2040+1020+540=3600