In a school with 600 students the average age of the…

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In a school with 600 students, the average age of the boys is 12 years and that of the girls is 11 years. If the average of the school is 11 years 9 months, then the average the number of girls in the school is :

  1. A. 150
  2. B. 250
  3. C. 350
  4. D. 450

Answer: Option A

Here is complete explanation of In a school with 600 students the average age of the….

Solution(By ExamCraze Team)

Let the number of girls be x
Then, number of boys = (600 - x)
Then,
$$left( {11frac{3}{4} times 600} right)$$   = 11x + 12 (600 - x)
⇔ x = 7200 - 7050
⇔ x = 150

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