Bella bought b boxes of cookies to bring to a party. She decided to keep two boxes. Each box contains 18 cookies. She bring 90 cookies to the party. Which equation can be used to find the number of boxes b valobot. How many boxes did she buy
Let b represent the number of boxes Bella bought.
Since she decided to keep two boxes, she brought b - 2 boxes to the party.
Each box contains 18 cookies, so the total number of cookies she brought is (b - 2) * 18 = 90.
Therefore, the equation to find the number of boxes b is: (b - 2) * 18 = 90.
To solve for b: (b - 2) * 18 = 90.
Dividing both sides of the equation by 18: b - 2 = 90 / 18.
Simplifying the right side of the equation: b - 2 = 5.
Adding 2 to both sides of the equation: b = 5 + 2.
Simplifying the right side of the equation: b = 7.
Bella bought 7 boxes of cookies.