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


1. 87
2. 82
3. 83
4. 84
5. None of these

1 Answer

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Best answer
Correct Answer - Option 1 : 87

Given:

Average marks of a student in 7 subjects = 75

Average marks in 6 subjects excluding Science = 73

Formula used:

Average = Sum of values/number of values

Calculation:

The average marks of a student in seven subjects = 75

The sum of marks of a student in seven subjects = 75 × 7

 525

The average marks in six subjects, excluding Science = 73

The sum of marks of a student in seven subjects = 73 × 6

 438

Science scored in Science = The sum of marks in seven subjects - the sum of marks without Science

Marks scored in Science = 525 - 438

 87

 Marks scored in Science is 87.

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