Question 903790: The length of the rectangular floor of a classroom is twice as long in width. The area of the floor is 1800 square feet.what is the width of the floor in feet.
Answer by yanyu123(2)   (Show Source):
You can put this solution on YOUR website! First we can say the width of the classroom is x. Since the length is twice as long in width, the length is 2x.
The formula of a rectangular's area is Area= Length * Width. We know that the area of the floor is 1800 square feet.
Therefore, 1800 = 2x * x, 1800 = 2*(x^2), x^2 = 900 and x= sqrt(900) =30. Now we know x= 30 and we set the width of the classroom is x. So, the width of the floor is 30 feet.
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