Question

Which among the following has the fourth highest population density of wild animals?

• A. A5
• B. A7
• C. A3
• D. A2

Answer 1

The correct option is D A2

Pie charts given in the question present two different data for seven regions namely A1 to A7. Left-hand piechart presents the population distribution of wild animals in seven regions whereas right-hand pie chart presents the land under forest cover distribution in seven regions.
Population density = $\frac{PercentageNumberofAnimals}{PercentageLandAreaUnderForestCover}$

If the question would have asked us 'maximum' or 'minimum'. we could have solved it through the process of elimination. Since the question asks us to evaluate "fourth highest population density." it is better that we calculate the density for each of the regions and identify the fourth highest.
A1 = 1.266 A2 = 0.928
A3 = 0.909 A4 = 1.375
A5 = 1 A6 = 0.833
A7 = 0.89
Alternatively, we can use some guestimation skills to shorten the caluclation porcess:
Three regions - namely A1, A4 and A5 are clearly greater than or equal to 1. So, fourth highest is a value closest and lower than 1.
Hence, option (d) is the answer.