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The average marks of a student in six subjects were 75. His average marks in seven subjects, including Maths, was 73. How many marks did he score in Maths?


1. 67
2. 69
3. 61
4. 75
5. None of these

1 Answer

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Best answer
Correct Answer - Option 3 : 61

Given:

Average of six subjects = 75

​Average of seven subjects = 73

Formula used:

Average = Sum of values/number of values

Calculation:

The average marks of a student in six subjects = 75

The sum of marks of a student in six subjects = 75 × 6

⇒ 450

The average marks in seven subjects, including Maths = 73

The sum of marks of a student in seven subjects = 73 × 7

⇒ 511

Marks scored in Maths = The sum of marks included maths - the sum of marks with out Maths 

Marks scored in Maths = 511 - 450

⇒ 61

∴ Marks scored in Maths is 61.

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