Identify the cost of a single book

Oct 13, 2025 by wbrum.org 141 views

Understanding the Problem

In this problem, we are given the cost of a single book, which is 169 rupees. We need to find the cost of 20 such books. This is a simple multiplication problem, where we need to multiply the cost of a single book by the number of books.

Breaking Down the Problem

To solve this problem, we can follow these steps:

Identify the cost of a single book: The cost of a single book is given as 169 rupees.
Identify the number of books: We need to find the cost of 20 such books.
Multiply the cost of a single book by the number of books: To find the total cost, we need to multiply the cost of a single book by the number of books.

Calculating the Cost

Now, let's calculate the cost of 20 books:

Cost of a single book = 169 rupees Number of books = 20

Total cost = Cost of a single book × Number of books = 169 × 20 = 3380 rupees

Conclusion

Therefore, the cost of 20 books is 3380 rupees.

Why is this Problem Important?

This problem is important because it helps us understand the concept of multiplication and how it can be applied to real-life situations. In this case, we are multiplying the cost of a single book by the number of books to find the total cost. This is a simple example of how multiplication can be used to calculate the cost of multiple items.

Real-World Applications

This problem has many real-world applications, such as:

Shopping: When you are shopping for multiple items, you need to calculate the total cost by multiplying the cost of a single item by the number of items.
Business: In a business setting, you may need to calculate the total cost of multiple products or services by multiplying the cost of a single product or service by the number of products or services.
Finance: In finance, you may need to calculate the total cost of multiple investments by multiplying the cost of a single investment by the number of investments.

Tips and Tricks

Here are some tips and tricks to help you solve this problem:

Use a calculator: If you are not comfortable with multiplication, you can use a calculator to find the total cost.
Break down the problem: Break down the problem into smaller steps, such as identifying the cost of a single book and the number of books.
Check your work: Double-check your work to ensure that you have calculated the total cost correctly.

Common Mistakes

Here are some common mistakes to avoid when solving this problem:

Rounding errors: Be careful not to round errors when multiplying the cost of a single book by the number of books.
Incorrect calculation: Double-check your calculation to ensure that you have calculated the total cost correctly.
Not considering the number of books: Make sure to consider the number of books when calculating the total cost.

Conclusion

Q: What is the cost of 25 books if each book costs 169 rupees?

A: To find the cost of 25 books, we need to multiply the cost of a single book by the number of books. So, the total cost is:

Cost of a single book = 169 rupees Number of books = 25

Total cost = Cost of a single book × Number of books = 169 × 25 = 4225 rupees

Q: If the cost of a single book is 169 rupees, what is the cost of 15 books?

A: To find the cost of 15 books, we need to multiply the cost of a single book by the number of books. So, the total cost is:

Cost of a single book = 169 rupees Number of books = 15

Total cost = Cost of a single book × Number of books = 169 × 15 = 2535 rupees

Q: What is the cost of 30 books if each book costs 169 rupees?

A: To find the cost of 30 books, we need to multiply the cost of a single book by the number of books. So, the total cost is:

Cost of a single book = 169 rupees Number of books = 30

Total cost = Cost of a single book × Number of books = 169 × 30 = 5070 rupees

Q: If the cost of a single book is 169 rupees, what is the cost of 20 books and 5 books?

A: To find the cost of 20 books and 5 books, we need to multiply the cost of a single book by the number of books for each quantity. So, the total cost is:

Cost of a single book = 169 rupees Number of books for 20 books = 20 Number of books for 5 books = 5

Total cost = (Cost of a single book × Number of books for 20 books) + (Cost of a single book × Number of books for 5 books) = (169 × 20) + (169 × 5) = 3380 + 845 = 4225 rupees

Q: What is the cost of 40 books if each book costs 169 rupees?

A: To find the cost of 40 books, we need to multiply the cost of a single book by the number of books. So, the total cost is:

Cost of a single book = 169 rupees Number of books = 40

Total cost = Cost of a single book × Number of books = 169 × 40 = 6760 rupees

Q: If the cost of a single book is 169 rupees, what is the cost of 10 books and 10 books?

A: To find the cost of 10 books and 10 books, we need to multiply the cost of a single book by the number of books for each quantity. So, the total cost is:

Cost of a single book = 169 rupees Number of books for 10 books = 10 Number of books for 10 books = 10

Total cost = (Cost of a single book × Number of books for 10 books) + (Cost of a single book × Number of books for 10 books) = (169 × 10) + (169 × 10) = 1690 + 1690 = 3380 rupees

Conclusion

In conclusion, we have answered some frequently asked questions about calculating the cost of multiple books. We have used the formula Cost of a single book × Number of books to find the total cost for each question. We hope that these answers have been helpful in understanding how to calculate the cost of multiple books.