Question

Mihai a parcurs 30% dintr-un drum si mai are de parcurs inca 210 km . Cati km are drumul ?

Answer 1

$\frac{70}{100}$ din x =210

70x=21000
x=21000:70
x=300 km 

Answer 2

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