Ina si Ana au impreuna 125 timbre .Ina are cu 5 timbre mai mult decat dublul nr timbrelor Anei.Cate timbre are Ina? .b) Cate timbre are Ana?C) cate timbre trebuie sa-i dea Ana colegei sale ina casa aiba o patrime din nr timbrelor Inei?
x-nr de timbre are Ana y-nr de timbre are Ina x+y=125 timbre y=2*x+5 x+2x+5=125 3x=125-5 x=120:3 x=40 a)ina are 125-40=85 timbre b)Ana are 40 de timbre c)40-x=1/4*85+x 4*(40-x)=85+x 160-4x=85-x 160-85=x+4x 5X=75 x=15
