code: protected int determineElementsPerPart(int numberOfPartitions) {
          double numberOfElementsWithinFile = sourceFile.getFilledUpFromContentStart() / sourceFile.getElementSize();
          double elementsPerPart = numberOfElementsWithinFile / numberOfPartitions;
          int roundNumber = (int) Math.ceil(elementsPerPart);
          return roundNumber;
      }
docs: Determines the number of elements when the partitions must have equal sizes
  
  @param numberOfPartitions
  @return int