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If the sum of two numbers is 15 and one number is 9, what is the other number?

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Question: If the sum of two numbers is 15 and one number is 9, what is the other number?

Options:

  1. 6
  2. 5
  3. 7
  4. 8

Correct Answer: 6

Solution: 

Let the other number be x. Then, 9 + x = 15. Thus, x = 15 - 9 = 6.

If the sum of two numbers is 15 and one number is 9, what is the other number?

Practice Questions

Q1
If the sum of two numbers is 15 and one number is 9, what is the other number?
  1. 6
  2. 5
  3. 7
  4. 8

Questions & Step-by-Step Solutions

If the sum of two numbers is 15 and one number is 9, what is the other number?
  • Step 1: Identify the two numbers. We know one number is 9.
  • Step 2: Let the other number be represented as 'x'.
  • Step 3: Write the equation for the sum of the two numbers: 9 + x = 15.
  • Step 4: To find 'x', subtract 9 from both sides of the equation: x = 15 - 9.
  • Step 5: Calculate the result: 15 - 9 equals 6.
  • Step 6: Therefore, the other number is 6.
  • Algebraic Manipulation – The question tests the ability to set up and solve a simple equation based on a word problem.
  • Understanding of Addition – It assesses the understanding of the relationship between numbers in an addition context.
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