scenario：At a restaurant, each adult meal costs $5 and kids eat free. If a group of 15 people came in and 8 were kids.
Question:how much would it cost for the group to eat?
Please start from the problem and write down the thought process and the corresponding formula for each step Your answer should have exactly 4 paragraphs. Make sure that the first paragraph starts with the word "ways" and that each paragraph is separated by two new lines.
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