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The average of three numbers is 30. If one number is 20, what is the average of

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Question: The average of three numbers is 30. If one number is 20, what is the average of the other two numbers?

Options:

  1. 35
  2. 30
  3. 25
  4. 20

Correct Answer: 25

Solution: 

Total of three numbers = 3 * 30 = 90. Sum of other two numbers = 90 - 20 = 70. Average = 70 / 2 = 35.

The average of three numbers is 30. If one number is 20, what is the average of

Practice Questions

Q1
The average of three numbers is 30. If one number is 20, what is the average of the other two numbers?
  1. 35
  2. 30
  3. 25
  4. 20

Questions & Step-by-Step Solutions

The average of three numbers is 30. If one number is 20, what is the average of the other two numbers?
  • Step 1: Understand that the average of three numbers is 30.
  • Step 2: Calculate the total of the three numbers by multiplying the average by 3: 3 * 30 = 90.
  • Step 3: One of the numbers is given as 20.
  • Step 4: Find the sum of the other two numbers by subtracting 20 from the total: 90 - 20 = 70.
  • Step 5: To find the average of the other two numbers, divide their sum by 2: 70 / 2 = 35.
  • Average Calculation – Understanding how to calculate the average of a set of numbers by summing them and dividing by the count.
  • Subtraction in Averages – Using subtraction to find the sum of remaining numbers when one number is known.
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