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The average of 10 numbers is 40. If one number is removed, the average becomes 3

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Question: The average of 10 numbers is 40. If one number is removed, the average becomes 38. What is the removed number?

Options:

  1. 42
  2. 40
  3. 38
  4. 36

Correct Answer: 42

Solution: 

Total of 10 numbers = 10 * 40 = 400. Total of 9 numbers = 9 * 38 = 342. Removed number = 400 - 342 = 58.

The average of 10 numbers is 40. If one number is removed, the average becomes 3

Practice Questions

Q1
The average of 10 numbers is 40. If one number is removed, the average becomes 38. What is the removed number?
  1. 42
  2. 40
  3. 38
  4. 36

Questions & Step-by-Step Solutions

The average of 10 numbers is 40. If one number is removed, the average becomes 38. What is the removed number?
  • Average Calculation – Understanding how to calculate the average and how it changes when a number is removed.
  • Total Sum of Numbers – Calculating the total sum of a set of numbers based on their average.
  • Difference Calculation – Finding the difference between the total sums to determine the removed number.
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