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There are 45 questions on your math exam. you answered 810 of them correctly. how many questions did you answer correctly?
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The areas of two similar triangles are 72dm2 and 50dm2. the sum of their perimeters is 226dm. what is the perimeter of each of these triangles?
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Explain how knowing 50×4 = 200 you find 500 × 400...
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