Multiple choice

The average marks of 28 students in math were 50. When 8 students left the school, then the average increased by 5. What is the average of marks obtained by the students who left?

  1. 37.5

  2. 12.5

  3. 17.5

  4. 39.3

  5. 300

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Total marks of 28 students is 28*50 = 1400. After leaving of 8 students total marks is 20*55 = 1100. Decrease in total marks is 1400-1100 = 300. This decrement is the total marks of 8 students who left the class. Thus average is 300/8 = 37.5