Multiple choice

In a class of 60 students, there are 20 girls who scored an average of 40 marks in the test. What is the average marks of the boys if the class average is 60 marks?

  1. 60

  2. 70

  3. 50

  4. 80
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total marks = 60 * 60 = 3600. Girls' total = 20 * 40 = 800. Boys' total = 3600 - 800 = 2800. Number of boys = 60 - 20 = 40. Average of boys = 2800 / 40 = 70.

AI explanation

The total marks of the entire class is 60 students times 60, which equals 3600. The total marks scored by the 20 girls is 20 times 40, giving 800. Therefore, the 40 boys scored 3600 - 800 = 2800 marks in total. The average marks for the boys is 2800 divided by 40, which equals 70.

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