Simple Explanation
Original density \(Population/Area\) है। Population और area दोनों यदि same proportion यानी 20 percent बढ़ें तो new ratio \(\frac{1.2Population}{1.2Area}\) होगा। दोनों तरफ 1.2 cancel हो जाता है, इसलिए density unchanged रहती है। तीसरा विकल्प सही है। परीक्षा में numerator और denominator समान percentage से बदलें तो ratio के unchanged रहने का principle याद रखें। / Original density is \(Population/Area\). If both population and area increase by the same proportion, 20 percent, the new ratio becomes \(\frac{1.2Population}{1.2Area}\). The factor 1.2 cancels, so density remains unchanged. Therefore, the third option is correct. In examinations, remember that a ratio stays the same when numerator and denominator change by an equal percentage.
