Items left in a warehouse are (I(d)=300-20d). When will (120) items be left?
Answer and explanation
Correct answer: \(d=9\)
For 120 items to remain, set \(I(d)=120\). Thus, \(300-20d=120\), so \(20d=180\) and \(d=9\). Therefore, the correct option is \(d=9\). At \(d=8\), 140 items would remain, so it is a close but incorrect distractor. Exam tip: In a linear expression problem, equate the expression to the required target value and solve.
Frequently asked questions
What is the correct answer to this question?
\(d=9\)
Why is this the correct answer?
For 120 items to remain, set \(I(d)=120\). Thus, \(300-20d=120\), so \(20d=180\) and \(d=9\). Therefore, the correct option is \(d=9\). At \(d=8\), 140 items would remain, so it is a close but incorrect distractor. Exam tip: In a linear expression problem, equate the expression to the required target value and solve.
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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