Assuming that Jeremy spent the entire $100 on the party supplies, here's the breakdown:
$100 - $30 = $70 remaining.
$70 - $10 = $60 remaining.
If he spent $60 on ten hats, and each hat was the same price, then each hat would have cost:
[tex]hat = \frac{60}{10}\\hat = 6[/tex]
The equation is as follows:
[tex]100 - 30 - 10 - 10(6)[/tex]
Each hat was $6
