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The average of two numbers is 40. If one number is 30, what is the other number?

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Question: The average of two numbers is 40. If one number is 30, what is the other number?

Options:

  1. 50
  2. 60
  3. 70
  4. 80

Correct Answer: 50

Solution: 

Let the other number be x. (30 + x) / 2 = 40. So, 30 + x = 80. Therefore, x = 50.

The average of two numbers is 40. If one number is 30, what is the other number?

Practice Questions

Q1
The average of two numbers is 40. If one number is 30, what is the other number?
  1. 50
  2. 60
  3. 70
  4. 80

Questions & Step-by-Step Solutions

The average of two numbers is 40. If one number is 30, what is the other number?
Correct Answer: 50
  • Step 1: Understand that the average of two numbers is found by adding the two numbers together and then dividing by 2.
  • Step 2: We know the average is 40, so we can write the equation: (30 + x) / 2 = 40.
  • Step 3: To eliminate the division, multiply both sides of the equation by 2: 30 + x = 80.
  • Step 4: Now, isolate x by subtracting 30 from both sides: x = 80 - 30.
  • Step 5: Calculate the result: x = 50.
  • Average Calculation – Understanding how to calculate the average of two numbers and manipulate equations to find an unknown value.
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