GWD22-Q27

dabiaoxun

GWD22-Q27

At a sale all books were priced equally and all magazines were priced equally.  What was the price of 3 books and 4 magazines at the sale?

(1) At sale the price of a book was $1.45 more than the price of a magazine.

(2) At sale the price of 6 books and 8 magazines was $43.70.

                  

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

答案B.是不是这种有小数的题﹐ 6X+8Y=43.7, X, Y 的值一定是固定的? 我之前在GWD6-Q30 有类似题﹐可是等式是0.15X+0.29Y=4.40. 后者因为书本是一定要整数﹐所以X﹐Y 值固定. 可是这题价格可以是小数啊﹐那就可以有多个组合了?

dengxy80

我觉得应该是C才对。如果是要求价格是integers,应该在条件中说明。

即使这道题要求价格是integers, 认为 B 正确，那B中的X、Y有好多组合。所以，还是满足不了解题要求。

shuishuiles

这道题好像和INTEGER没有关系吧。

题目问： the price of 3 books and 4 magazines at the sale

B At sale the price of 6 books and 8 magazines was $43.70

除以2不就是 3books and 4 magazines的Prices 嘛。。

robert

同意shuishuiles。

所以读题理解题非常重要。有时候是文字题，但考的是同余。

如何准确的分析题目考的是什么，是做数学题要思考的东西。如果这点做好了，50或51也就不远了