Question

11 metri de sfoara costa 1705 lei . Cat costa 5 metri de sfoara de aceasi calitate ?

Answer 1

11 m ...........1705 lei
  5 m ............    x lei 

x = 1705 x 5 : 11 = 775  lei 

Answer 2

$11~m~stofa~.......... ~1705 ~ lei 5~m~stofa~.......... ~x ----------------------------------- Sunt~marimi~direct~proportionale~(~d.p.~) \frac{11}{5} = \frac{1705}{x} = \ \textgreater \ x = \frac{5 * 1705}{11} = \ \textgreater \ \frac{ 8525 }{11} = \ \textgreater \ \boxed{x = 775~lei}$