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Math Help - volume

  1. #1
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    volume

    A rectangular box is 20 cm high and twice as long as it is wide. If it has a surface area of 1600cm^2, what is its volume?
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    Quote Originally Posted by andrewpark2 View Post
    A rectangular box is 20 cm high and twice as long as it is wide. If it has a surface area of 1600cm^2, what is its volume?
    let the width of the box be x. then the length is 2x. so we have a box where,

    height = 20
    length = 2x
    width = x

    the surface area is the sum of the areas of all the faces. assuming the box is closed, there are 6 in all.

    the volume is given by length*width*height
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  3. #3
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    what do you mean?
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    Quote Originally Posted by andrewpark2 View Post
    what do you mean?
    what do you mean what do i mean. i gave you the dimensions of the box and told you how to find surface area and volume. just plug in the values you have

    use the surface area equation to solve for x, then you can find the volume
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  5. #5
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    What's the surface area question
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  6. #6
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    I mean equation.
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    Quote Originally Posted by andrewpark2 View Post
    I mean equation.
    i told you, it is the sum of the area of all the faces.

    draw a diagram of the box. label the height, length and width as i told you, and just find the area of each face. the top the bottom and all the sides. each side is a rectangle, so the area is just the length times width of the rectangle. then add them all up and set it equal to 1600 to solve for x
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