Question

Violeta are cu 30 de alune mai mult decat Rodica si Rodica are jumatatedin nr.alunelor Violetei.Cate alune are fiecare?La cati copii pot da cate 10 alune cele doua fete?

Answer 1

a= nr alune Violeta
a-30=nr alune rodica
a-30=a/2
2a-60=a
a=60 alune Violeta
60-30=30 alune Rodica
60+30=90 alune in total
90:10=9 copii 

Answer 2

V=R+30
R=V/2          V=V/2+30  se aduce la acelasi numitor
2×V-V=30×2⇒ 
 V=60 alune are Viorica
R=V/2=60/2=30
deci R=30 alune are Rodica
 total = V+R=60+30=90 alune in total
cati copii vor primi cate 10 alune:    total:10⇒  90:10=  9  copii