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A battery decreases by the model (B(h)=120-10h) percent. When will the battery be (50%)?बैटरी (B(h)=120-10h) प्रतिशत मॉडल से घटती है। बैटरी (50%) कब होगी?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: \(h=7\)\(h=7\)
Set \(B(h)=50\) because the battery level is required to be 50%. Thus, \(120-10h=50\), so \(10h=70\) and \(h=7\). At \(h=6\), the battery level would be 60%, so that option is not correct. Exam tip: In linear decay questions, equate the model to the required value first and then solve for the variable.बैटरी का प्रतिशत 50 होने के लिए \(B(h)=50\) रखें। अतः \(120-10h=50\), इसलिए \(10h=70\) और \(h=7\) मिलता है। \(h=6\) पर बैटरी 60% होगी, इसलिए वह विकल्प सही नहीं है। परीक्षा टिप: रैखिक क्षय के प्रश्नों में पहले दिए गए मान के बराबर मॉडल रखें, फिर चर को हल करें।
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