The length of a rectangle is three times it's width . If the perimeter is 84 , find the length of the rectangle
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Let the width of rectangle be x. Therefore, it's length will be 3x.
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If we let a = length and b and c = width, then we know that the perimeter is 2a+2b+2c = 84. Since the length is triple the width we also know that a = 2c.
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