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

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

Options:

  1. 15 - x
  2. x + 15
  3. x - 15
  4. x/15

Correct Answer: 15 - x

Solution: 

Let the other number be y. Then x + y = 15. Therefore, y = 15 - x.

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

Practice Questions

Q1
If the sum of two numbers is 15 and one number is x, what is the other number?
  1. 15 - x
  2. x + 15
  3. x - 15
  4. x/15

Questions & Step-by-Step Solutions

If the sum of two numbers is 15 and one number is x, what is the other number?
  • Step 1: Identify the two numbers. One number is given as x.
  • Step 2: Let the other number be represented as y.
  • Step 3: Write the equation that represents the sum of the two numbers: x + y = 15.
  • Step 4: To find the other number y, rearrange the equation to isolate y: y = 15 - x.
  • Algebraic Manipulation – The question tests the ability to manipulate equations to isolate a variable.
  • Understanding of Variables – The question assesses the understanding of how to represent unknowns with variables.
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