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Priya is buying raisins and almonds to make trail mix. Almonds cost $5.20 per pound and raisins cost $2.75 per pound. Priya spent $11.70 buying almonds and raisins. The relationship between pounds of almonds a, pounds of raisins r, and the total cost is represented by the equation 5.20a + 2.75r = 11.70. How many pounds of raisins did Priya buy if she bought a pounds of almonds?