Julie made a scale drawing of an comanche helicopter. if the helicopter's rotors are 12 feet long, how long are they in her drawing

The problem seems to lack the details on the scaling of the drawing. But to answer the question, for example each feet in real life scenario is only 1 cm long in her drawing, we can use ratio and proportion to answer the problem. In the example that I have given, the length of the rotor in the drawing should be 12 cm.