To find out how much Molly's family plans to spend on meals, we'll follow these steps:
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Calculate the amount spent on gasoline and motel rooms:
\[ \text{Amount for gasoline and motel rooms} = \frac{3}{5} \times 3,000 = 1,800 \]
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Calculate the remainder after spending on gasoline and motel rooms:
\[ \text{Remainder} = 3,000 - 1,800 = 1,200 \]
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Calculate the amount spent on meals (which is half of the remainder):
\[ \text{Amount for meals} = \frac{1}{2} \times 1,200 = 600 \]
Thus, Molly's family plans to spend $600 on meals.
The answer is A. $600.