Question

Cookies are on sale! Today each cookie costs $0.75 less than the normal price. Right now if you buy 7 of them it will only cost you$2.80 Write an equation to determine the normal price of each cookie.

Answer 1

Let's say that the price of each normal cookie is n.
The equation would then be 7(n - .75)=2.80.
Use distributive property, getting 7n - 5.25=2.80.
Add 5.25 to each side of the equation, getting 7n=8.05. 
Divide 7 from both sides of the equation, getting n=1.15.