某公開試去年的合格人數為77500人.今年該公開試的合格人數為74400人.
(a)(球)合格人數的百分數增減.
(b)經覆卷後,今年該公開試的合格人數增加左x人.如果今年合格人數較去年的合格人數之百分數增減為-3.76%,(球)x.
幫幫忙(數學)
2006-11-15 7:23 am
回答 (2)
2006-11-15 7:37 am
✔ 最佳答案
a. 合格人數是:(74400-77500)/77500x100%
=-3100/77500x100%
=-4%(下降)(現在假設今年與去年的是相同人數)
其實每年考試人數不一，不能作出比較，這題問題是不合理的。
b.設今年新的合格人數是y人
(y-77500)/77500x100% = - 3.76%
y-77500 = - 3.76/100 x 77500
y-77500 = - 2914
y = 74586
答:今年新的合格人數是74586人。
x=74586-74400
x=186
2006-11-15 7:32 am
a) change of %,
(74400-77500)/77500*100%
=4%(decreased)
b)let x be the no. of ppl increase
(74400+x-77500)/77500*100%=-3.76%
x=186
so this year have 186+74400=74586 pass in total
(74400-77500)/77500*100%
=4%(decreased)
b)let x be the no. of ppl increase
(74400+x-77500)/77500*100%=-3.76%
x=186
so this year have 186+74400=74586 pass in total
收錄日期: 2021-04-18 20:27:50
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061114000051KK05233