A students gets 75, 82 and 86 marks in an examination. How many matks he should get so that average becomes 85?
Answers
Answered by
1
Answer:
He needs 97 marks more so that his average becomes 85
Step-by-step explanation:
Average = Sum of outcomes/ No. of outcomes
= 75 + 82 + 86 + x / 4 = 85 [ We need to add "x" otherwise the average won't be 85]
= 243 + x / 4 = 85
= 243 + x = 85 * 4 [ Cross Multiply ]
= 243 + x = 340
= x = 340 - 243 = 97
Hence he needs 97 marks more so that his average becomes 85
WELCOME
Similar questions