Question

Cosmin a economisit cu 36 de lei mai mult decat Radu, iar Marius a economisit de 3 ori mai mult decat Cosmin.Impreuna au economisit 1059 lei. Cati lei a economisit fiecare copil?

Answer 1

x(x+36)+3(x+36)=1059
x+x+36+3x+108=1059
5x=1059-108-36
5x=915
x=$\frac{915}{5}$
x=183 (lei are Radu)
183+36=219(lei are Cosmin)
3*219=   657(lei are Marius)
183+219+657=1059