Multiple choice

The average marks obtained by S in 15 tests is 29. R is maintaining an average of 27 so far but has taken only 11 of the tests so far. How much does R have to score on an average in the remaining four tests to match S's performance?

  1. 36

  2. 35.5

  3. 35

  4. 34.5
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D Correct answer
Explanation

S's total marks after 15 tests is 29 x 15 = 435. R has scored 27 x 11 = 297 marks in 11 tests. To match S's total, R needs 435 - 297 = 138 more marks across 4 remaining tests. Required average = 138/4 = 34.5. This accounts for the total needed rather than just matching the average.

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