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
The equation that can be used to find the number of boxes, b, Bella bought is 18b - 2 = 90. So, she bought b = 5 boxes.
To solve this problem, we can set up an equation to represent the situation. Let's let "b" represent the number of boxes Bella bought. Since each box contains 18 cookies and she decided to keep two boxes, Bella brings (18b - 2) cookies to the party.
According to the problem, Bella brings 90 cookies to the party. We can set up the equation as follows:
18b - 2 = 90
To solve for "b", we need to isolate the variable. First, we can add 2 to both sides of the equation to get rid of the constant term:
18b - 2 + 2 = 90 + 2
This simplifies to:
18b = 92
Next, we divide both sides of the equation by 18 to solve for "b":
(18b)/18 = 92/18
This further simplifies to:
b = 5
So, Bella bought 5 boxes of cookies.
Therefore, the correct equation is: 18b - 2 = 90; b = 5.
The correct equation that can be used to find the number of boxes, b, Bella bought is 18b - 2 = 90. By rearranging the equation and isolating b, we get 18b = 92 and b = 5.
Therefore, Bella bought 5 boxes of cookies.