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?(1 point)
Responses
18b−2=90; b=518b−2=90; b=5
2b−18=90; b=542b−18=90; b=54
18b−36=90; b=718b−36=90; b=7
18b−36=90; b=6
The correct answer is: 18b-2=90; b=5. She bought 5 boxes.
The equation that can be used to find the number of boxes, b, Bella bought is: 18b - 2 = 90.
To solve this equation and find the value of b, we can add 2 to both sides of the equation: 18b - 2 + 2 = 90 + 2.
Simplifying the equation gives us: 18b = 92.
Finally, 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 find the number of boxes, b, Bella bought, we need to set up an equation based on the given information.
We know that each box contains 18 cookies and Bella decides to keep two boxes. So the total number of cookies Bella kept is 2 * 18 = 36 cookies.
Now, Bella brings 90 cookies to the party. Therefore, the equation can be set up as: 18b - 36 = 90.
To solve for b, we need to isolate the variable. Adding 36 to both sides of the equation gives: 18b = 126.
Finally, dividing both sides by 18 gives: b = 7.
So Bella bought 7 boxes of cookies.
Therefore, the correct equation is 18b - 36 = 90 and the correct answer is b = 7.