※ 引述《officium (officium)》之铭言： : 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? 他的意思应该是1/4的人在Q1回答yes,然後这些人当中又有1/3的人在Q2回答yes 最後他问有多少人没有两题都回答yes,所以答案应该是 N*(1-(1/4)*(1/3))=11N/12 : 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? 假设去年的出席率是x 假设的是1.25x 实际的是0.8x 他问的是 0.8x/1.25x=64% (其实我也看不太懂题目,是照答案推的=.=) : 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 到这边没问题 接着假设第一天的平均速率是v 所以第二天的是v+1 v*8+(v+1)*10=18v+10=64 v=3 --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 140.112.4.249 ※ 编辑: tingting88 来自: 140.112.4.249 (06/01 17:35)