Q: Mrs. Thompson bought 3 chickens for $3 each. She also bought a bag of potatoes. Mrs. Thompson paid $15 in total. How much did the potatoes cost?
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A: The 3 chickens amount to $3 x 3 = $<<3*3=9>>9.
Hence, the potatoes cost $15 - $9 = $<<15-9=6>>6. The answer is  6.
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