Lesson eLearning

The average daily vehicular pollution level in Mumbai is 150 units. If a traffic rule reduces the number of vehicles by 25%, how many units does the pollution level reduce?

hard MCQ 3 marks Class 4 · EVS · Nandita in Mumbai
  1. A) 35
  2. B) 37.5
  3. C) 50
  4. D) 75
Answer
B) 37.5

The correct answer is B) 37.5 — Option B is correct.

Step-by-step solution

  1. Recognise that a 25% reduction means 25% of the current pollution level.
  2. Calculate 25% of 150: 150 × 0.25 = 37.5.
  3. Therefore, the pollution level reduces by 37.5 units.
  4. Option B is correct.
Common mistake: Confusing percentage reduction with remaining percentage or forgetting to compute 25% of the total

Concept tested: Calculating percentage reduction

Published · How this solution was prepared and checked

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