Question

Maria, felicia si casian au impreuna 60 lei. Maria are de 3 ori mai putin decat Felicia care are cu 3 mai mult decat casian. Cati lei re fiecare copil?.

Answer 1

Răspuns:

m+f+c=60

m=f/3=>f=3m

f=c+3=>c=f-3=>c=3m-3

m+3m+3m-3=60

7m=60+3

m=63:7=>m=9 lei are Maria

f=3×9=>f=27 lei are Felicia

c=27-3=>c=24 lei are Casian

verificare:

9+27+24=60 lei