Răspuns :
x=suma initiala
x - 1/3*x - 2/5*x = 400
15x-5x-6x=6000
4x=6000
x= 1500 lei
x - 1/3*x - 2/5*x = 400
15x-5x-6x=6000
4x=6000
x= 1500 lei
1/3*x +2/5*x +400=x
x/3+2x/5 +400=x
5x+6x+6000=15x
6000=15x-11x
4x=6000
x= 1500 lei.
x/3+2x/5 +400=x
5x+6x+6000=15x
6000=15x-11x
4x=6000
x= 1500 lei.