Mary earns $20 washing cars and $40 walking dogs each month. If she puts half of that money away each month how long would it take her to save $150? Give me reasons, before answering the question
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Each month she makes 20 + 40 = $60. Every month she saves 60 / 2 = $30. To save $150 it will take her 150 / 30 = 5 months. So the final answer is 5.
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