Răspunsuri

2014-08-04T16:29:39+03:00
X-suma initiala

x-10  -restul

40%  din x-10=  40/100 *(x-10)=  10/25 *(x-10)=  2/5 *(x-10)=   2(x-10)/5=  (2x-20)/5 a cheltuit

10+(2x-20)/5= x/2  aducem la acelasi numitor

100+4x-40=5x

60+4x=5x

4x-5x= -60

-x= -60

x=60 lei