Lesson eLearning

If a number is multiplied by 3 and then 12 is subtracted, the result is 15. What is the number?

medium 2 marks Class 3 · Mathematics · Fun with Numbers
Answer
9

The correct answer is 9 — The number is 9.

Step-by-step solution

  1. Let the unknown number be .
  2. Write the algebraic expression: .
  3. Add 12 to both sides: .
  4. Divide both sides by 3: .
  5. The number is 9.
Common mistake: Subtracting instead of adding 12 on the left side

Concept tested: Solving a simple linear equation

Published · How this solution was prepared and checked

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