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The average of three numbers is 20. If one number is 10, what is the average of

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Question: The average of three numbers is 20. If one number is 10, what is the average of the other two numbers?

Options:

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

Correct Answer: 15

Solution: 

Total of three numbers = 20 * 3 = 60. The sum of the other two = 60 - 10 = 50. Average = 50 / 2 = 25.

The average of three numbers is 20. If one number is 10, what is the average of

Practice Questions

Q1
The average of three numbers is 20. If one number is 10, what is the average of the other two numbers?
  1. 15
  2. 20
  3. 25
  4. 30

Questions & Step-by-Step Solutions

The average of three numbers is 20. If one number is 10, what is the average of the other two numbers?
Correct Answer: 25
  • Step 1: Understand that the average of three numbers is 20.
  • Step 2: Calculate the total of the three numbers by multiplying the average by the number of numbers: 20 * 3 = 60.
  • Step 3: One of the numbers is given as 10.
  • Step 4: To find the sum of the other two numbers, subtract the known number from the total: 60 - 10 = 50.
  • Step 5: Now, to find the average of the other two numbers, divide their sum by 2: 50 / 2 = 25.
  • Average Calculation – Understanding how to calculate the average of a set of numbers and how to manipulate the total sum based on known values.
  • Basic Arithmetic – Applying basic arithmetic operations to find sums and averages.
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