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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?

Răspuns :

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 

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