Give the step-by-step reasoning process and then the final answer. Sara sent letters to her friend in China every month. She sent 6 letters in January, 9 letters in February, and in March she sent triple the number of letters she sent in January. How many letters does Sara send?
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Combining January and February, Sara sent 6 + 9 = 15 letters. In March, she sent 3 * 6 = 18 letters. Altogether, Sara sent 15 + 18 = 33 letters.
The final answer: 33.
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