Question

Intr-o cutie sunt bile rosii,albe si negre.Din total, 3/6 sunt bile rosii,5/8 din rest sunt albe,iar 9 sunt negre.Cate bile sunt in cutie

Answer 1

3/6·y=3y/6=y/2=r⇒r=y/2;
⇒a ramas y-y/2=2y/2-y/2=y/2;
⇒5/8 ·y/2=5y/16=a⇒a=5y/16;
⇒a ramas y/2-5y/16=8y/16-5y/16=3y/16=9
⇒3y/16=9
⇒y=16·9/3
⇒y=16·3
⇒y=48[bile sunt in cutie];