Three quarters of the boats in the marina are white, 4/7 of the remaining boats are blue, adn the rest are red. If there are 9 r
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A rectangle has four sides, two equal to the width and two equal to the length. So, the perimeter is
If we know that the width is 5, and the perimeter is 125, we have
In your case, the unkown is called x, but the concept is the same:
where x is the length of the rectangle.