Mathematics · Chain Rule
200 बल्बों को 6 दिनों के लिए 4 घंटे प्रतिदिन जलाने की लागत ₹160 है। ₹384 में 15 दिनों के लिए 3 घंटे प्रतिदिन कितने बल्ब जलाए जा सकते हैं?
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