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In an exam, the average marks obtained by Kajol in Mathematics, History and Social science were 75. His average marks in English, Hindi and Mathematics were 79. If the average marks in all five subjects is 76.20, then, what is his score in mathematics?

In an exam, the average marks obtained by Kajol in Mathematics, History and Social science were 75. His average marks in English, Hindi and Mathematics were 79. If the average marks in all five subjects is 76.20, then, what is his score in mathematics? Correct Answer 81

Given:

The average marks of Mathematics + History + Social Science = 75

The average marks of English + Hindi + Mathematics = 79

The average marks of five subjects = 76.20

Formula used:

Total Score = Average Marks × number of subjects

Calculation:

Total score in Mathematics, History and Social Science = 75 × 3 = 225

Total score in English, Hindi and Mathematics = 79 × 3 = 237

Total score in five subjects = 76.20 × 5 = 381

⇒ Marks obtained in mathematics = (225 + 237) - 381 = 462 - 381

∴ Marks obtained in mathematics = 81

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