Question

Ina si Ana au in preuna 125 timbre.Ina are cu 5 timbre mai mult decit dublul nr.timbrelor Anei. a) Cite timbre are Ina? b) Cite timbre are Ana?c)Cite timbre trebuie sa-i dea Ana colegei sale ,Ina,ca sa aiba o patrime din nr. timbrelor Inei.

Answer 1

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