When a class of 40 students took a science test, 25 students had an average score of 80, and the remaining students had an average score of 90. What was the average score of the whole class?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 83.75.
Total score of 25 students = 25 × 80 = 2000
Total score of remaining 15 students = 15 × 90 = 1350
Required average = (2000 + 1350)/40
⇒ 3350/40 = 83.75