$\"\"$

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Rectangular page contain $\"\"$ of print.

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So the printed area inside margins is $\"\"$ .

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$\"\"$

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The margins on each side are $\"\"$ .

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The margins on length is $\"\"$ .

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The margins on width is $\"\"$ .

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Minimised area is $\"\"$ .

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Substitute $\"\"$ in the above equation.

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$\"\"$

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$\"\"$

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Apply derivative on each side with respect to $\"\"$ .

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$\"\"$

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$\"\"$

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To find minimum amout of paper is used, equate $\"\"$ to zero.

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$\"\"$

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$\"\"$

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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The dimensions of the paper that the least amount of paper is used :

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Length of the paper is $\"\"$ .

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Width of the paper is $\"\"$ .

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$\"\"$

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The dimensions of the paper that the least amount of paper is used :

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Length of the paper is $\"\"$ .

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Width of the paper is $\"\"$ .