Solid state fermentations (SSF’s) involve solid substrates at low moisture levels or water activities where
quantitative reasoning analysis shows ratio, percentage and series logic determine correct calculation. Consequently the water content is between 40-80% 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.
