David is buying notebooks and pens for his class. He buys 3 notebooks, and each notebook costs $4. Then, he buys 2 pens. David spends a total of $16. He wants to know the amount he spent on each pen.

Answer 1

Let's start by calculating how much David spent on the notebooks.

David buys 3 notebooks, and each notebook costs $4. Thus, the total cost for the notebooks can be calculated as follows:

$$\text{Total cost of notebooks}=\text{Number of notebooks}\times \text{Cost per notebook}=3\times 4=12\text{ dollars}$$

Now, we know that the total amount David spends is $16. To find out how much he spent on the pens, we can subtract the cost of the notebooks from the total amount spent:

$$\text{Total cost of pens}=\text{Total cost}-\text{Total cost of notebooks}=16-12=4\text{ dollars}$$

David buys 2 pens for a total of $4. To find the cost of each pen, we can divide the total cost of the pens by the number of pens:

$$\text{Cost per pen}=\frac{\text{Total cost of pens}}{\text{Number of pens}}=\frac{4}{2}=2\text{ dollars}$$

Therefore, the amount David spent on each pen is $2.