Julie is buying muffins and doughnuts for her soccer team. Each muffin, m, costs $1.50 and each doughnut, d, costs $1.00. Julie
spends a total of $24.00 on muffins and doughnuts. Enter an equation that represents the total amount, in dollars, that Julie spends, on muffins and doughnuts.
We can solve this by setting up a proportion where 864/12 = 504/x. We cross multiply and get 864x = 504 * 12. So 864x = 6048. Divide by 864 on both sides, x = 7.