O persoana are o suma s de bani.in prima zi cheltuieste 30% din suma S,a doua ziv cheltuiestr 1 supra 4 din S.Stiind ca persoanei ii raman 6 lei,aflati cat a cheltuit in prima zi
100% = suma totala 1/4=25% 100%-(30%+25%)=100%-55%=45% ii raman 45%.........................6 lei 100%...................... x lei x=100x6:45=600:45=13,(3) lei suma totala 13,3x30:100=399,(9):100=3,(9) lei a cheltuit in prima zi
