Question

A students gets 75, 82 and 86 marks in an examination. How many matks he should get so that average becomes 85?

Answer 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