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Average marks of a student in the first 5 terminal exams is 60 and the average of the first 2 terminal exams is 30. Find the average of last 3 terminal exams.
1. 60
2. 70
3. 80
4. 10

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Correct Answer - Option 3 : 80

Given

Average of first 5 terminal exam = 60

Average of first 2 terminal exam = 30

Calculation

Sum of marks in first 5 terminal exam = 60 × 5 = 300

Sum of marks in first 2 terminal exam = 30 × 2 = 60

⇒ Sum of marks in last 3 terminal exam = 300 - 60

⇒ Sum of marks in last 3 terminal exam = 240

Average marks of last 3 terminal exam = 240/3 = 80

∴ The average of last 3 terminal exam is 80.

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