Question

Write the following into algebraic language.

The cost of $x$ books at $Rs.40$ per book and $y$ pens at $Rs.12$ per pen.

Answer 1

Step 1: Find the total cost of books

Given, the cost of $x$ books at $Rs.40$ per book and $y$ pens at $Rs.12$ per pen.

If cost of $1$ book is $Rs.40$

Then, cost of $x$ is $x\times 40=Rs.40x$

Step 2: Find the total cost of pens.

If cost of $1$pen is $Rs.12$.

Then, cost of $y$ pens is $y\times 20=Rs.20y$

Step 3: Final answer.

Hence, the required answer is $Rs.40x+Rs.20y$.