How many numbers are in the list $ 147, 144, 141, \ldots, 42, 39?$
Question:
How many numbers are in the list $ 147, 144, 141, \ldots, 42, 39?$
Answer:
Let's think step by step.

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How many numbers are in the list $ 147, 144, 141, \ldots, 42, 39?$
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