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A number decreased by 7 equals 12. What is the number?

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Question: A number decreased by 7 equals 12. What is the number?

Options:

  1. 5
  2. 19
  3. 7
  4. 12

Correct Answer: 19

Solution: 

Let the number be x. Then x - 7 = 12. Add 7 to both sides: x = 19.

A number decreased by 7 equals 12. What is the number?

Practice Questions

Q1
A number decreased by 7 equals 12. What is the number?
  1. 5
  2. 19
  3. 7
  4. 12

Questions & Step-by-Step Solutions

A number decreased by 7 equals 12. What is the number?
  • Step 1: Identify the unknown number and call it x.
  • Step 2: Write the equation based on the problem: x - 7 = 12.
  • Step 3: To isolate x, add 7 to both sides of the equation.
  • Step 4: The equation now looks like this: x - 7 + 7 = 12 + 7.
  • Step 5: Simplify both sides: x = 19.
  • Algebraic Equations – The question tests the ability to set up and solve a basic linear equation.
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