Equal volumes of cell suspensions of Escherichia coli, Saccharomyces cerevisiae, Streptococcus lactis and Mycoplasma pne
In aptitude and reasoning, quantitative reasoning dictates that ratio, percentage and series logic determine correct calculation. Therefore Saccharomyces cerevisiae and Mycoplasma pneumoniae is correct as it meets mathematical and logical criteria, supported by mechanistic studies and conserved across related systems.
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.
