Vedantu Class 7 Chapter-9 Unitary Method Free PDF RS Aggarwal Solutions
FAQs on RS Aggarwal Solutions Class 7 Chapter-9 Unitary Method (Ex 9A) Exercise 9.1
1. How do the RS Aggarwal Solutions for Class 7 Maths Chapter 9 help me solve Exercise 9A correctly?
The RS Aggarwal Solutions for Class 7 Maths Chapter 9 provide a detailed, step-by-step guide for every problem in Exercise 9A. They help you understand the correct application of the Unitary Method, verify your own answers, and learn the standard format for presenting solutions as per the CBSE 2025-26 curriculum.
2. What is the fundamental first step when solving any problem from Exercise 9A using the Unitary Method?
The fundamental first step in the Unitary Method is to calculate the value of a single unit from the given information. For instance, if the cost of 12 pens is provided, your first calculation should be to find the cost of 1 pen. This 'per unit' value is the key to finding the value for any required number of units.
3. Why is the method used in this chapter called the 'Unitary Method'?
The name 'Unitary Method' comes from the word 'unit', which means one. The entire problem-solving process is built around the core principle of first finding the value of a single unit (like the cost of one item, the distance covered in one hour, etc.). Once this single unit's value is known, you can easily find the value for any quantity.
4. What is the correct method to solve word problems involving cost and quantity in RS Aggarwal Ex 9A?
To correctly solve word problems involving cost and quantity from Exercise 9A, you should follow these steps:
- Step 1: Identify the given information, which is typically the total cost for a specific number of items.
- Step 2: Calculate the cost of one single item by dividing the total cost by the given number of items.
- Step 3: Multiply the cost of this single item by the new number of items for which you need to find the total cost.
5. How can I identify if a problem in Chapter 9 involves direct proportion?
You can identify a problem of direct proportion when two quantities are related in such a way that an increase in one causes a proportional increase in the other, and a decrease in one causes a decrease in the other. For example, in Exercise 9A, if you buy more notebooks, the total cost increases. This direct relationship is the key identifier for applying the standard Unitary Method.
6. How do the solutions for RS Aggarwal Exercise 9A help in preparing for school exams?
These solutions are designed to align with the CBSE 2025-26 syllabus and marking guidelines. By practising with them, you master the correct, step-wise format for presenting your answers. This not only ensures you get the right result but also helps you score full marks for showing the proper method in your school exams.
7. How is the Unitary Method from Chapter 9 connected to the concept of Ratios and Proportions?
The Unitary Method is a practical application of the concept of Ratios and Proportions. When you find the value of one unit, you are essentially finding the unit rate, which simplifies a ratio. For example, if 10 oranges cost ₹120, the ratio is 10:120. The Unitary Method finds the unit rate of 1:12 (₹12 per orange), which is then used to solve for other quantities while maintaining the same proportion.
8. After mastering direct proportion in Exercise 9A, what is the next concept to learn in the Unitary Method?
After mastering the direct proportion problems in Exercise 9A, the next logical concept to focus on is inverse proportion. This applies to situations where an increase in one quantity causes a decrease in another (for example, more workers taking less time to finish a job). Understanding inverse proportion is a crucial extension of the Unitary Method and is often covered in subsequent exercises.
