Ali has a small flower shop. He sold 4 flowers on Monday, 8 flowers on Tuesday and on Friday, he sold double the number of flowers he sold on Monday. How many flowers does Ali sell? Let's think first. Chain of thought:
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Combining Tuesday and Monday, Ali sold 4 + 8 = 12 flowers. On Friday, he sold 2 * 4 = 8 flowers. Altogether, Ali sold 12 + 8 = 20 flowers.
Therefore, the answer is 20.
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