Practice question
Question
In a class of 60 students, 30 students have taken Physics; 30 Chemistry and 30 Biology. There are 10 students each who have taken a combo of 2 subjects i.e. Phy-Chem, Phy-Bio and Chem-Bio. The number of students who have taken all 3 subjects is
Explanation
This outcome reflects quantitative reasoning, where ratio, percentage and series logic determine correct calculation. Option A captures this correctly because it meets mathematical and logical criteria, consistent with textbook descriptions and experimental observations in aptitude and reasoning.
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