Răspunsuri

2014-06-21T19:30:43+03:00
2014-06-21T19:33:29+03:00
X-lungimea drumului

100%-30%=70% -restul 

70% din x= 70/100* x= 7/10* x = 7x/10-restul de drum

7x/10=210

x=10*210/7

x=10*30
x=300