day3.dart

void main() {
  barnyard(head: 20, leg: 76);
}

barnyard({head, leg}) {
  var goat = (leg / 2) - head;
  var chicken = head - goat;
  if (goat is int &&
      chicken is int &&
      !goat.isNegative &&
      !chicken.isNegative) {
    print('There are $goat goats and $chicken chicken in my barnyard');
  } else {
    print('Invalid entries. Try again');
  }
}
/* I used c + 3g = leg-head and c + g = head to get g = (leg/2) - head & c = head - g
 * 
 * I intentionally allowed the user to enter more than int because I dont want the red error of the compiler and want to define my own error statement
 * */