Directions: The following table gives the percentage of marks obtained by 7 students in 6 different subjects in an examination. Study the table and answer the questions based on it. Note: The numbers in the brackets give the maximum marks in each su…

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Concept & Calculation: The table provides the percentage of marks obtained, not the absolute marks. The absolute marks for a subject are calculated as: Marks = ( \frac{Percentage}{100} ) × Maximum Marks Step-by-Step Solution: 1. Maths: 90% of 150 = ((90/100)) × 150 = 135 2. Chemistry: 60% of 130 = ((60/100)) × 130 = 78 3. Physics: 70% of 120 = ((70/100)) × 120 = 84 4. Geography: 70% of 100 = ((70/100)) × 100 = 70 5. History: 90% of 60 = ((90/100)) × 60 = 54 6. Computer Science: 70% of 40 = ((70/100)) × 40 = 28 7. Total Aggregate Marks: 135 + 78 + 84 + 70 + 54 + 28 = 449 Exam Strategy & Shortcut: To calculate percentages like 90% of 150 mentally, simply multiply the non-zero digits (9 × 15 = 135). Do this for all subjects and sum them up quickly: 135 + 78 + 84 + 70 + 54 + 28 = 449. Common Pitfall: Summing the percentages directly instead of converting them to absolute marks first. Remember that the percentages are based on different maximum marks, so they cannot be added together. Final Answer: Therefore, the correct answer is 449.

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