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If, on a coordinate plane, points A has coordinates (-3,4), how far is point A from point E? (1)point E is on the y-axis four units from the origin (2)if point A were twice as far from point E, it would be the same distance from point E as point C is at coordinates (0,-2).
答案是C
At Consolidated Foundries, for a resolution to become policy, a quorum of at least half the 20 directors must pass the resolution by at least a two-third majority. At a meeting of the board of directors, did resolution X pass or fail? (1)Ten diectors voted for the resolution. (2)Seven directors voted against the resolution.
答案是B
At a certain department store present-warpping counter,each clerk will warp no fewer than twenty and no more than thirty presents per hour. If seventy people standing in line, will all of their presents be wrapped after one hour? (1)Each preson in line has at least one present to be wrapped by one of the six clerks at the counter (2)If each person in line had one more present to be wrapped, nine clerks would be required to guarantee that every present would be wrapped in one hour.
答案是C Each clerk wraps a minimum of 20 presents per hour. Since 9 clerks can wrapped at least 180 presents. (2 ) tells you that If each person in line had one more present they would have 180 presents. Since there are 70 people in line, so there are 180-70=110 presents to be wrapped. 我不理解的是为什么要减去70？ 请指教！  | 
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发表于 2009-4-5 22:02:00
