A students average marks (arithmetic mean) on three tests is 80. Which of the following CANNOT be the number of tests on
The principle of quantitative reasoning explains that ratio, percentage and series logic determine correct calculation. Hence 2 fits best because it meets mathematical and logical criteria, as documented in authoritative sources on aptitude and reasoning.
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.
