og ds问题:求解两道题目意思。。
286: the rectangular rug shown in the figure above has an accent border. what is the area of the portion of the rug that excludes the border?
(1) The perimeter of the rug is 44 feet. (2) The width of the border on all sides is 1 foot. ![]()
291:In a product test of a common cold remedy, x percent of the patients tested experienced side effects from the use of the drug and y percent experienced relief of cold symptoms. What percent of the patients tested experienced both side effects and relief of cold symptoms?
(1) Of the 1,000 patients tested, 15 percent experienced neither side effects nor relief of cold symptoms.
(2) Of the patients tested, 30 percent experienced relief of cold symptoms without side effects.
291这个题主要是答案的解析。。让我郁闷的是 :难道题目中给的X&Y不是已知数吗?题目中都说了。如果是已知的,答案就不是e了。
谢谢啦!·~~
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