Multiple choice general knowledge math & puzzles

In a recent examination a class had an average score of 71. Average score of boys is 60 and average score of girls was 80. Which of the following is greater ? Col A: No. of boys who took the test Col B: No. of girls who took the test

  1. Col A

  2. Col B

  3. Both are equal

  4. Can’t be determined
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let b = number of boys, g = number of girls. Using weighted averages: 60b + 80g = 71(b + g). Solving: 60b + 80g = 71b + 71g, so 9g = 11b. Since 9/11 < 1, we have g > b. Therefore, the number of girls (Col B) is greater. Option C is incorrect because the numbers differ. Option D is incorrect because we can determine the relationship.

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