arduino blinking LED with different frequencies

blinking_LED.ino

const float femaleMaleRatio = 95.0/65;

const int maleLight = 3; // PIN
const int maleBrightness = 190; // brightness for male light. value should be in [0, 255]
const int maleInterval = 500; // after how many ms the male light should be switched on/off

const int femaleLight = 11; // PIN
const int femaleBrightness = maleBrightness * femaleMaleRatio;
const int femaleInterval = maleInterval * femaleMaleRatio;

// the setup function runs once when you press reset or power the board
void setup() {
  pinMode(maleLight, OUTPUT);
  pinMode(femaleLight, OUTPUT);
}

// checks if a light should be active based on its interval
bool isActive(unsigned int interval) {
  unsigned long currentTime = millis();
  return currentTime % (2 * interval) > interval ? true : false;
}

// the loop function runs over and over again forever
void loop() {
  analogWrite(maleLight, maleBrightness * isActive(maleInterval)); // switch on/off male light
  analogWrite(femaleLight, femaleBrightness * isActive(femaleInterval)); // switch on/off female light
}