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题库 / Prep2007E1-DS-56
During a sale, a clothing store sold each shirt at a price of $15 and each sweater at a price of $25. Did the store sell more sweaters than shirts during the sale?
(1) The average (arithmetic mean) of the prices of all of the shirts and sweaters that the store sold during the sale was $21.
(2) The total of the prices of all of the shirts and sweaters that the store sold during the sale was $420.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
shirt = x, sweater = y ，y>x?
(1) ,15x+25y=21x+21y,4y=7x,y>x。
(2) 15x+25y=420 不只一组解。
或者 直接想， 如果一边多的情况下平均数是20，现在是21，肯定卖25块钱的那个多。不用算具体数值，就是能回答多或者不多就可以了。
把化简之后的条件(1)带入条件（2）不可以算出来么
奥 知道了 犯糊涂了····
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