trei copii au 6900 RON Primul are 1700 RON al doilea are de trei ori mai mult decât al treilea Câți lei are fiecare copil?
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notam copiii cu a,b,c.
a+b+c=6900
a=1700
b=3c
INLOCUIM:
a+b+c=6900
1700+3c+c=6900
1700+4c=6900
4c=6900-1700
4c=5200
c=5200:4
c=1300
b=3x1300
b=3900
Raspuns:Primul copil are 1700RON ,al doilea copil are 3900RON si al treilea copil are 1300RON.