Lesson eLearning

A whole number is increased by 7 and the result is multiplied by 3 to give 60. Find the original number.

easy 1 mark Class 6 · Mathematics · Whole Numbers
Answer
13

The correct answer is 13 — Subtract 7 from both sides: (x=13).

Step-by-step solution

  1. Let the unknown number be (x).
  2. Form the equation: (3(x+7)=60).
  3. Divide both sides by 3: (x+7=20).
  4. Subtract 7 from both sides: (x=13).
Common mistake: adding 7 after multiplying by 3 instead of before

Concept tested: solving linear equation with whole numbers

Published · How this solution was prepared and checked

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