Q25: If the number 52,1n9, where n represents the tens digit, is a multiple of 3, then the value of n could be which of the following? A. 6 B. 5 C. 3 D. 1 E. 0 Answer: d Q28: Last Sunday a certain store sold copies of Newspaper A for $1.00 each and copies of Newspaper B for $1.25 each, and the store sold no other newspapers that day. If r percent of the store’s revenues from newspaper sales was from Newspaper A and if p percent of the newspapers that the store sold were copies of newspaper A, which of the following expresses r in terms of p? A. 100p / (125 – p) B. 150p / (250 – p) C. 300p / (375 – p) D. 400p / (500 – p) E. 500p / (625 – p) Answer: d 请问一下这两题要怎麽去解 去大陆的网站看就只有一个不懂而已 --

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