Calculating the length of the side of a square - GMAT Quantitative

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Question

Square A has twice the sidelength of Square B. The total area of the squares is 605 square feet. What is the sidelength of Square B?

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Answer

Let be the sidelength of Square B. Then the sidelength of Square A is , and the areas of Squares A and B are and , respectively. Since the areas add up to 605 square feet, we solve for in this equation:

feet

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