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Kunal marks increased in each semester by 35. There were 3 semesters. In first semester he scored 25 marks. Calculate his average marks in three semesters.
1. 60
2. 45
3. 49
4. 20

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Correct Answer - Option 1 : 60

Given

Marks scored in first semester = 25

Formula used

Average = Sum of all observation/Number of observation

Calculation

Marks in first semester = 25

Marks in second semester = 25 + 35

Marks in third semester = 25 + 35 + 35

Average of 3 semesters = [25 + (25 + 35) + (25 + 35 + 35)]/3 

⇒ (25 + 60 + 95)/3

⇒ 180/3

⇒ 60

∴ Average marks in three semesters is 60

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