Final answer:
To determine the normal price of each cookie when cookies are on sale, an equation can be written as x = y/n, where 'x' is the normal price, 'y' is the cost at the sale price, and 'n' is the number of cookies being bought.
Step-by-step explanation:
To write an equation to determine the normal price of each cookie, we can first assign variables to the given information. Let's say the normal price of each cookie is 'x' dollars, and the number of cookies you want to buy is 'n'. Since each cookie costs less than the normal price, we can represent the cost of buying 'n' cookies as the product of 'n' and a fraction of the normal price, which can be written as 'n(x/n)'. The equation can be written as nx/n = y, where 'y' is the cost at the sale price. To determine the normal price 'x', we can solve for it by multiplying 'n' to both sides of the equation, giving x = y/n. Therefore, the equation to determine the normal price of each cookie is x = y/n.