यदि किसी region की population और area दोनों 10 प्रतिशत घटें तो density पर क्या प्रभाव पड़ेगा?
If both population and area of a region decrease by 10 percent what happens to population density?
Explanation opens after your attempt
C. समान रहेगाRemain unchanged
Simple Explanation
नई population \(0.9P\) और नया area \(0.9A\) होगा। नया density \(\frac{0.9P}{0.9A}=\frac{P}{A}\) इसलिए unchanged रहेगा। विकल्प C सही है। population और area दोनों समान proportion से बदलने पर उनका ratio नहीं बदलता। परीक्षा में equal proportional change का rule याद रखें; यह density calculation के कई कठिन प्रश्न सरल बना देता है। / New population is \(0.9P\) and new area is \(0.9A\). New density becomes \(\frac{0.9P}{0.9A}=\frac{P}{A}\), so it remains unchanged. Therefore option C is correct. When population and area change by exactly the same proportion their ratio does not change. Remembering this rule simplifies many difficult density questions.
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