Ricky can type 161 words in 7 minutes. At this rate, Joe says that Ricky should be able to type 174 words in 20 minutes. Sue says that Joe is incorrect and Ricky can type 460 words in 20 minutes. Mary says that both Joe and Sue are incorrect. Mary thinks that Ricky should be able to type. 87 words per 20 minutes. Who is correct? Justify and Explain why that person is correct.
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