In a class the average score of girls in an examination…

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In a class, the average score of girls in an examination is 73 and that of boys is 71. The average score for the whole class is 71.8. Find the percentage of girls :

  1. A. 40%
  2. B. 50%
  3. C. 55%
  4. D. 60%

Answer: Option A

Here is complete explanation of In a class the average score of girls in an examination….

Solution(By ExamCraze Team)

Let the number of girls = x
And, the number of boys = y
According to the question,
73x + 71y = 71.8 (x + y)
1.2x = 0.8y
$$frac{x}{y}$$ = $$frac{2}{3}$$
∴ Girls% = $$frac{2}{2 + 3}$$ × 100
= $$frac{2}{5}$$ × 100
= 40%

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