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A battery remains (B(h)=100-8h) percent. When will the battery be (60%)?एक बैटरी (B(h)=100-8h) प्रतिशत बचती है। बैटरी (60%) कब होगी?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: 5 घंटे5 घंटे
For the battery to be at 60%, put \(B(h)=60\) in the model: \(100-8h=60\). Thus, \(8h=40\), so \(h=5\) hours. At 4 hours, the battery would be \(100-8(4)=68\%\), so that option is not correct. Exam tip: In linear decay questions, equate the function to the required target value first, then solve for the variable.बैटरी के 60% रहने पर मॉडल में \(B(h)=60\) रखें: \(100-8h=60\)। अतः \(8h=40\), इसलिए \(h=5\) घंटे। 4 घंटे पर बैटरी \(100-8(4)=68\%\) रहेगी, इसलिए वह सही नहीं है। परीक्षा टिप: ऐसे रैखिक क्षय प्रश्नों में पहले दिए गए लक्ष्य प्रतिशत को फलन के बराबर रखकर चर का मान निकालें।
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