A student collects 120 different living organisms from a pond ecosystem. If 40% are microscopic organisms,…

A student collects 120 different living organisms from a pond ecosystem. If 40% are microscopic organisms, 25% are plants, and the rest are animals, how many animal species did the student collect to study in the animal group?
  1. 42
  2. 35
  3. 48
  4. 30

Solution

Subtracting plant and micro-organism percentages from 100% leaves $35\%$ for animals. Calculating $35\%$ of 120 gives $0.35 \times 120 = 42$ animal species.

Asked in: Homi Bhabha Practice

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