Multiple choice general knowledge math & puzzles

Sharada reads an average of 20 books per year. She read 23, 17, 20, and 19 books in four different years. How many books did Sharada read in the 5th year to make it an average of 20 per year?

  1. 20

  2. 21

  3. 19

  4. 17

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

For a 5-year average of 20 books, total books = 20 × 5 = 100. Sum of first 4 years = 23 + 17 + 20 + 19 = 79. Year 5 = 100 - 79 = 21. This maintains the average.