Give the step-by-step reasoning process and then the final answer. Sarah is planning to do some baking. She buys 5 pounds of rye flour, 10 pounds of whole-wheat bread flour, and 3 pounds of chickpea flour. Sarah already had 2 pounds of whole-wheat pastry flour at home. How many pounds of flour does she now have?
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She bought 5 + 10 + 3 = 18 pounds. She now has 18 + 2 = 20 pounds.
The final answer: 20.
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