A student’s average marks in 4 subjects is 75. What should be his score in the fifth subject to get an overall average of 78?
Show answer & explanation
Correct answer: A
Explanation
Given:
Average of 4 subjects = 75
Total subjects = 5
New average = 78
Formula:
Total marks = Average × Number of subjects
Total marks of 4 subjects = 4 × 75 = 300
Total marks of 5 subjects = 5 × 78 = 390
Marks of 5th subject = 390 − 300 = 90