Ian's science book has 20 fewer pages than his math book. Ian's science book has 250 pages. Which equation can be used to calculate how many pages Ian's math book has? Let the variable p stand for the number of pages in the math book. A. 250 - 20 = p B. 250 = p + 20 C. 20 - p = 250 D. 250 = p - 20
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