9. Linda's Bakery sells three kinds of cookies: chocolate chip cookies at 15 cents each, oatmeal cookies at 20 cents each, and peanut butter cookies at 25 cents each. Charles buys some of each kind and chooses three times as many peanut butter cookies as chocolate chip cookies. If he spends $4.10 on 19 cookies, how many oatmeal cookies did he buy? 7 more 10.

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