Multiple choice

In an examination, average marks of a student per paper were 61. If he would have obtained 19 more marks in english; 13 more marks in hindi and 8 more marks in maths, his average marks per paper would have been 66. How many papers were there in the examination?

  1. 5

  2. 6

  3. 7

  4. 8
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let n be the number of papers. Total marks = 61n. After bonus marks, total = 61n + 19 + 13 + 8 = 61n + 40. New average = (61n + 40)/n = 66. Solving: 61 + 40/n = 66, so 40/n = 5, giving n = 8. There were 8 papers in the examination.

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