When dealing with basic mathematical problems, it's essential to break down the steps carefully to ensure accuracy. In this article, we'll explore the process of calculating the cost of a specific number of postcards and determining the quantity you can buy within a given budget, using the example of 15 postcards costing Rs 2.25 and Rs 45 to be spent in total.

Introduction to Postcard Costs and Quantities

To start, let's understand the cost of a single postcard. We are given that 15 postcards cost Rs 2.25. Using simple division, we can find the cost of one postcard:

Cost of one postcard Rs 2.25 / 15 Rs 0.15

Cost of 36 Postcards

Next, let's calculate the cost of 36 postcards, given that each postcard costs Rs 0.15. The formula to find the total cost is the number of postcards multiplied by the cost per postcard:

Cost of 36 postcards 36 × Rs 0.15 Rs 5.40

This calculation shows that 36 postcards will cost Rs 5.40.

Buying Postcards with Rs 45.00

Now, let's find out how many postcards can be bought with Rs 45.00. We already know the cost of one postcard is Rs 0.15, so we can use division to determine the number of postcards that can be purchased:

Number of postcards Rs 45.00 / Rs 0.15 300

Thus, with Rs 45.00, you can buy 300 postcards.

Summary

In summary, we've calculated the cost of 36 postcards and the number of postcards that can be bought with Rs 45.00 using simple mathematical operations. The steps are straightforward and can be applied to similar problems:

Find the cost of one postcard. Calculate the total cost for a known number of postcards. Determine the quantity of postcards that can be bought with a given amount of money.

This article serves as a guide for anyone needing to solve similar cost and quantity problems involving basic arithmetic operations.