Răspuns :
100% - 80% = 20% a vandut
20% ............... 360 kg
100% ............... x kg
x = 360 x 100 : 20 = 1800 kg de mere a avut la inceput omul
20% ............... 360 kg
100% ............... x kg
x = 360 x 100 : 20 = 1800 kg de mere a avut la inceput omul
x -360 =80x/100
100x -36000 =80x
100x-80x =36000
20x =36000
x =1800 kg
100x -36000 =80x
100x-80x =36000
20x =36000
x =1800 kg