You can buy x pencils for 80p

How much will it cost to buy y pencils?

y/x * 80p

80y/x

yes

To find out how much it will cost to buy y pencils, we need to determine the cost per pencil. We know that you can buy x pencils for 80p, so the cost per pencil is 80p divided by x.

Once we have the cost per pencil, we can then calculate the total cost to buy y pencils by multiplying the cost per pencil by y.

Here are the steps to find the total cost:

1. Calculate the cost per pencil:
Cost per pencil = 80p / x

2. Calculate the total cost to buy y pencils:
Total cost = Cost per pencil * y

By following these steps, you can determine how much it will cost to buy y pencils based on the given information.