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If the sum of two numbers is 50 and one number is 20, what is the other number?

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Question: If the sum of two numbers is 50 and one number is 20, what is the other number?

Options:

  1. 30
  2. 20
  3. 40
  4. 10

Correct Answer: 30

Solution: 

Let the other number be x. Then, x + 20 = 50, so x = 50 - 20 = 30.

If the sum of two numbers is 50 and one number is 20, what is the other number?

Practice Questions

Q1
If the sum of two numbers is 50 and one number is 20, what is the other number?
  1. 30
  2. 20
  3. 40
  4. 10

Questions & Step-by-Step Solutions

If the sum of two numbers is 50 and one number is 20, what is the other number?
  • Step 1: Identify the two numbers. We know one number is 20.
  • Step 2: Let the other number be represented by 'x'.
  • Step 3: Write the equation for the sum of the two numbers: x + 20 = 50.
  • Step 4: To find 'x', subtract 20 from both sides of the equation: x = 50 - 20.
  • Step 5: Calculate the result: 50 - 20 equals 30.
  • Step 6: Therefore, the other number is 30.
  • Algebraic Manipulation – The question tests the ability to set up and solve a simple algebraic equation.
  • Understanding of Sum – The question assesses the understanding of the concept of sum and how to isolate variables.
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