A saving amount is (S(m)=300+40m) rupees. After how many months will the amount be (620) rupees?
Answer and explanation
Correct answer: 8
For the amount to become 620 rupees, form the equation 300+40m=620. Thus, 40m=320, so m=8. Therefore, the amount will be 620 rupees after 8 months. With 7 months, the amount would be only 580 rupees, so it is not correct. Exam tip: Substitute the target value in a linear expression and solve for the variable.
Frequently asked questions
What is the correct answer to this question?
8
Why is this the correct answer?
For the amount to become 620 rupees, form the equation 300+40m=620. Thus, 40m=320, so m=8. Therefore, the amount will be 620 rupees after 8 months. With 7 months, the amount would be only 580 rupees, so it is not correct. Exam tip: Substitute the target value in a linear expression and 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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