1 zi)x*20 /100=20x/100 ;x -20x/100 =80x/100 suma ramasa
2 zi)80x /100*25/100 =x /5 ; 80x /100-x /5 =80x -20x /100 =60x /100 suma ramasa
3 zi) 60x /100 *1/3 =60x /300 =x /5 ; 60x /100 -x /100 =40x /100 suma ramasa
4 zi)40x /100 *50/100 =20x /100 =x/5 ;40x/100 -x /5 =40x -20x/100 =x/5
20x/100 +x/5+x /5 +x/5 +45 =x numitor comun 100
20x+20x+20x+20x+4500 =100x
100x -80x =4500
20x =4500
x =4500 /20
x=225