Răspunsuri

2014-06-07T12:53:37+03:00
X-suma initiala

25% din x= 25/100*x= 1/4* x= x/4 -prima data

x-x/4= (4x-x)/4= 3x/4- restul

3/5 din 3x/4= 3/5 * 3x/4= 9x/20-a 2a oara

3x/4-9x/20= (15x-9x)/20= 6x/20 -noul rest

6x/20=240
x=20*240/6
x=20*40
x=800