A student has marks 78, 85, 90, and 92 in the four tests, what marks he has to get in the fifth exam to maintain an average of 85 marks?
Answer: 80
Explanation
Step 1: Calculate the total marks needed for an average of 85 over 5 exams.
Total marks needed=Average×Number of exams
Total marks needed=85×5
Total marks needed=425
Step 2: Calculate the sum of the marks from the first four exams.
78+85+90+92=345
Step 3: Subtract the sum of the first four exam marks from the total marks needed.
Marks needed in the fifth exam=425−345
Marks needed in the fifth exam=80
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