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If the sum of two numbers is 30 and one number is x, what is the other number?

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Question: If the sum of two numbers is 30 and one number is x, what is the other number?

Options:

  1. 30 - x
  2. x + 30
  3. x - 30
  4. x/30

Correct Answer: 30 - x

Solution: 

Let the other number be y. Then x + y = 30. Therefore, y = 30 - x.

If the sum of two numbers is 30 and one number is x, what is the other number?

Practice Questions

Q1
If the sum of two numbers is 30 and one number is x, what is the other number?
  1. 30 - x
  2. x + 30
  3. x - 30
  4. x/30

Questions & Step-by-Step Solutions

If the sum of two numbers is 30 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 for the sum of the two numbers: x + y = 30.
  • Step 4: To find y, rearrange the equation to isolate y: y = 30 - x.
  • Step 5: Now you have the expression for the other number y.
  • Algebraic Manipulation – The question tests the ability to manipulate equations to isolate a variable.
  • Understanding of Variables – It assesses the understanding of how to represent unknowns in mathematical problems.
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