Rice left in a bag is (R(d)=55-3d) kg. How much rice will remain at (d=5)?
Answer and explanation
Correct answer: 40 kg
Given \(R(d)=55-3d\). Substituting \(d=5\), \(R(5)=55-3(5)=55-15=40\) kg. Therefore, 40 kg of rice remains. The value 15 kg is only the amount decreased in 5 days, not the amount left. Exam tip: To find a function value, substitute the given number for the variable, multiply first, and then add or subtract.
Frequently asked questions
What is the correct answer to this question?
40 kg
Why is this the correct answer?
Given \(R(d)=55-3d\). Substituting \(d=5\), \(R(5)=55-3(5)=55-15=40\) kg. Therefore, 40 kg of rice remains. The value 15 kg is only the amount decreased in 5 days, not the amount left. Exam tip: To find a function value, substitute the given number for the variable, multiply first, and then add or subtract.
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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