To find out how much Molly's family plans to spend on meals, we can follow these steps:
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Calculate how much the family plans to spend on gasoline and motel rooms: They plan to spend \( \frac{3}{5} \) of the total amount they have, which is $3000.
\[ \text{Amount for gasoline and motel} = \frac{3}{5} \times 3000 = 1800 \]
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Calculate the remainder after spending on gasoline and motel rooms: Subtract the amount spent on gasoline and motel rooms from the total amount.
\[ \text{Remaining Amount} = 3000 - 1800 = 1200 \]
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Calculate how much they plan to spend on meals: They plan to spend \( \frac{1}{2} \) of the remaining amount on meals.
\[ \text{Amount for meals} = \frac{1}{2} \times 1200 = 600 \]
Therefore, Molly's family plans to spend $600 on meals.