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The average of 4 numbers is 25. If one number is removed, the average becomes 20

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Question: The average of 4 numbers is 25. If one number is removed, the average becomes 20. What is the removed number?

Options:

  1. 15
  2. 20
  3. 25
  4. 30

Correct Answer: 30

Solution: 

Total of 4 numbers = 4 * 25 = 100. Total of 3 numbers = 3 * 20 = 60. Removed number = 100 - 60 = 40.

The average of 4 numbers is 25. If one number is removed, the average becomes 20

Practice Questions

Q1
The average of 4 numbers is 25. If one number is removed, the average becomes 20. What is the removed number?
  1. 15
  2. 20
  3. 25
  4. 30

Questions & Step-by-Step Solutions

The average of 4 numbers is 25. If one number is removed, the average becomes 20. What is the removed number?
  • Average Calculation – Understanding how to calculate the average and relate it to the total sum of numbers.
  • Algebraic Manipulation – Using basic algebra to find the difference between totals to determine the removed number.
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