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If the average of two numbers is 40 and one of the numbers is 30, what is the ot

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Question: If the average of two numbers is 40 and one of the numbers is 30, what is the other number? (2023)

Options:

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

Correct Answer: 60

Exam Year: 2023

Solution: 

Let the other number be x. The average is (30 + x) / 2 = 40. Solving gives x = 50.

If the average of two numbers is 40 and one of the numbers is 30, what is the ot

Practice Questions

Q1
If the average of two numbers is 40 and one of the numbers is 30, what is the other number? (2023)
  1. 50
  2. 60
  3. 70
  4. 80

Questions & Step-by-Step Solutions

If the average of two numbers is 40 and one of the numbers is 30, what is the other number? (2023)
  • Step 1: Understand that the average of two numbers is found by adding the numbers together and dividing by 2.
  • Step 2: Let the unknown number be represented as 'x'.
  • Step 3: Write the equation for the average: (30 + x) / 2 = 40.
  • Step 4: To eliminate the division, multiply both sides of the equation by 2: 30 + x = 80.
  • Step 5: Now, isolate 'x' by subtracting 30 from both sides: x = 80 - 30.
  • Step 6: Calculate the result: x = 50.
  • Average Calculation – Understanding how to calculate the average of two numbers and manipulate equations to find unknown values.
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