class Evaporator
{

  public:
  static int evaporator(double content, double evap_per_day, double threshold);

  int day = 0;
  double contnetNow;
  double remain;

  remain = 100;
  contentNow = content;

  while (remain > threshold){
    contentNow = contentNow - evap_per_day;
    remain = (contentNow / content)*100;
    day++;
    }

  return day;
};