M8 17 In a nationwide poll, N people were interviewed. If 1/4 of them answered ”Yes” to Q1, and of those, 1/3 answered “Yes” to Q2, which of the following expressions represents the number of people interviewed who did not answer “Yes” to both Q? 我不懂的是 他给的条件都是第一个问题的 我只能从1-1/4=3/4得到第一个问题不是答Y的是3/4不是吗 我要怎麽知道第二个问题的呢 30 The organizers of a fair projected a 25% increase in attendance this year over that of last year, but attendance this year actually decrease by 20%. What percent of the projected attendance was the actual attendance? 他是问预测的是实际的百分之几 所以是拿预测减实际除实际不是嘛? 我用 (1.25-0.8) / 0.8 答案是56% 选 结果错了 答案是C 64% 谁可以告诉我我哪做错了 谢谢 22 A hiker walked for 2 days, On the second day the hiker walked 2 hours longer and at an average speed 1 mile per hour faster than he walked on the first day. IF during the two days he walked a total of 64 miles and spent a total of 18 hrs walking, what was his average speed on the first day 我设第一天走 x小时 所以第二天 x+2 2x+2=18 x=8 再设第一天走y mph 第二天走y+1 mph [8y+10(y+1) ] /18 =64 1142/28=63.4 得不到可以match到选项的答案 (选项分别是 2 3 4 5 6 mph) 我有看过单位 都是mile hr 呀 为什麽答案差那麽多 我哪里算错啦 (泣) 谢谢大家 T^T --

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