A battery remains (B(h)=100-8h) percent. When will the battery be (60%)?
Answer and explanation
Correct answer: 5 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.
Frequently asked questions
What is the correct answer to this question?
5 घंटे
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Introduction to Polynomials. Topic: Linear growth and decay.
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