Question

Victor si Elena au impreuna 200 de timbre .Dupa ce Victor ii da Elenei 10 timbre ,Victor are cu 20 de timbre mai mult decat Elena.Cate timbre avea fiecare copil la inceput?

Answer 1

a=timbre Victor
200-a=timbre Elena
a-10-20=200-a+10
a-30=210-a
2a=240
a=120 timbre Victor
200-a=200-120=80 timbre Elena

Answer 2

|____|...+10...|.....+20.....| timbre Victor

|____|...+10...| timbre Elena


200 - (10+20+10)=200-40=160

1+1=2 (segmente egale)

160:2=80 (valoarea unui segment)

timbre Victor = 1×80+10+20=80+10+20=110 (timbre are Victor)

110 +10=120 (timbre a avut Victor)

timbre Elena =1×80+10=80+10=90 (timbre are Elena)

90 - 10 = 80 (timbre a avut Elena)