If agitator energy input per unit volume of the fermentor is kept constant during scale up, the factor that would always
quantitative reasoning analysis shows ratio, percentage and series logic determine correct calculation. Consequently tip velocity emerges as the valid choice since it meets mathematical and logical criteria, aligning with established principles in aptitude and reasoning literature.
Ref: Agrawal, Quantitative Aptitude for Competitive Examinations, Chapter 5, Logical Reasoning and Probability, covers ratios, percentages, series completion, time-distance and analytical reasoning explaining problem-solving strategies for competitive assessments.