[問題]請問來欣的數學問題 M8 :)
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 他給的條件都是第一個問題的
我只能從1-1/4=3/4得到第一個問題不是答Y的是3/4不是嗎
我要怎麼知道第二個問題的呢
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?
他是問預測的是實際的百分之幾
所以是拿預測減實際除實際不是嘛?
我用 (1.25-0.8) / 0.8 答案是56% 選
結果錯了 答案是C 64%
誰可以告訴我我哪做錯了 謝謝
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
我設第一天走 x小時 所以第二天 x+2
2x+2=18 x=8
再設第一天走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到選項的答案
(選項分別是 2 3 4 5 6 mph)
我有看過單位 都是mile hr 呀 為什麼答案差那麼多
我哪裡算錯啦 (泣)
謝謝大家 T^T
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