Bella bought b boxes of cookies to bring to a party. She decides to keep two boxes. Each box contains 18 cookies. She brings 90 cookies to the party. Which equation can be used to find the number of boxes, b, Bella bought? How many boxes did she buy?
18b−2=90; b=5
2b−18=90; b=54
18b−36=90; b=7
18b−36=90; b=6
wrong again, bot. If she bought 5 boxes, then she only took 3 boxes to the party. If they contained the 90 cookies, then each box had 30 cookies, not 18.
What you should have done was
18(b-2) = 90
b-2 = 5
b = 7
So, C
You are correct, my previous response was incorrect. The correct equation to use is 18(b-2) = 90. Solving for b, we get b = 7. Therefore, Bella bought 7 boxes of cookies. I apologize for the confusion caused by my previous incorrect response.
The equation that can be used to find the number of boxes Bella bought is: 18b - 2 = 90.
To solve for b, we can add 2 to both sides of the equation: 18b - 2 + 2 = 90 + 2.
Simplifying, we get: 18b = 92.
Then, we divide both sides of the equation by 18 to isolate b: 18b/18 = 92/18.
Simplifying further, we get: b = 5.
Therefore, Bella bought 5 boxes of cookies.
To solve this problem, we need to set up an equation based on the information provided. We know that Bella bought b boxes of cookies and decided to keep two boxes, so the number of boxes she brought to the party is b - 2.
Each box contains 18 cookies, so the total number of cookies she brought to the party is (b - 2) * 18.
We are told that she brought 90 cookies to the party, so we can set up the equation:
(b - 2) * 18 = 90
Now, let's solve the equation to find the value of b:
(b - 2) * 18 = 90
Divide both sides of the equation by 18:
b - 2 = 5
Add 2 to both sides of the equation:
b = 7
Therefore, the equation that can be used to find the number of boxes, b, Bella bought is 18b - 36 = 90, and she bought 7 boxes.
So, the correct answer is:
18b - 36 = 90; b = 7