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Doctors Medicines MCQs Q&A

  1. 78.46
  2. 24.56
  3. 78.96
  4. 93.76
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1 Answers

Option 3 : 78.96

Given:

The number of students in class A is 42 and the average is 79

The number of students in class B is 38 and the average is 76

The number of students removed from class A is 5 and 

The average marks of class A  is increased by 3

Formula used:

Average marks of students = Total marks of students/Total number of students

Calculation:

Initially the number of students in class A = 42

Now, According to the question,

⇒ Total number of students in class A after removing 5 students = 37

⇒ The new average marks of students = (79 + 3) = 82

⇒ Total new marks of class A students = 37 × 82 = 3034

The number of students in class B is 38 and the average is 76

⇒ Total marks of class B students = 38 × 76 = 2888

The new average marks of students = Total marks of students/Total number of students

⇒ (3034 + 2888)/(37 + 38)

⇒ 5922/75

⇒ 78.96

∴ The new average marks of class A and class B is 78.96

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Related Questions

Questions below followed by three quantities. Find the relationship between them. Quantity I: In a class with a certain number of students if a teacher weighing 78 kg is added, then average weight of class is increased by 2 kg. If one more teacher weighing 66 kg is added, then the average weight of the class increases by 3.5 kg over the original average. What is the original average weight (in kg) of the class Quantity II: The average age of 16 students and their teacher's age is 16 years. If the teacher's age is excluded, the average reduces by 2. What is the teacher's age Quantity III: Average weight of three friends A, B and C is 46 kg. Another person D joins the group and now the average is 45 kg. If another person E whose weight is 6 kg more than D, joins the group replacing A, then average weight of B, C, D and E becomes 47 kg. What is the weight of A (in kg)?
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