Mathematics · Averages
कुछ पेन टैब की औसत लागत ₹2,500 है जबकि कुछ व्हाइटबोर्ड की औसत लागत ₹1,200 है। यदि दोनों वस्तुओं (पेन टैब और व्हाइटबोर्ड) की मिलाकर औसत लागत ₹2,000 है, तो कुल वस्तुओं में से व्हाइटबोर्ड की संख्या का प्रतिशत ज्ञात कीजिए। (दशमलव के दो स्थानों तक सही)
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