[計量] pp2-ds-17

[popolin29 (喵咪)]

17.     1097-!-item-!-187;#058&000661
Store S sold a total of 90 copies of a certain book during the seven days of
last week, and it sold different numbers of copies on any two of the days.
 If for the seven days Store S sold the greatest number of copies on Saturday
and the second greatest number of copies on Friday, did Store S sell more
than 11 copies on Friday?

(1)  Last week Store S sold 8 copies of the book on Thursday.

(2)  Last week Store S sold 38 copies of the book on Saturday.


Ans: B


解答是
(2) Sat.=38 ,90-38=52(剩下星期五,四,三,二,一,日 去分這52本)
因為星期五是要第二多的數量,先用11本試試看
五 四  三 二 一 日
11 10  9  8  7  6  (這樣相加只有51本,不足52本),所以只有星期五要大於11本的時候,
才有機會總合52,充分
==============================================================================
但是我不懂為什麼 四 三 二 一 日  可以確認是10 9 8 7 6  的數字

難道不會是多或更少 我知道不會超過禮拜五的11  其他星期的 就不懂了

不知道是不是我有漏掉些什麼資訊 沒注意到

再次麻煩各位了 謝謝大家~*

==============================================================================

還有另一題

One member of a committee of 5 men and 8 women resigned and was not replaced.
 What fraction of the remaining members were men?

(1)   of the remaining members were women.

(2)  The member who resigned was a woman.


【答案】D

但我算不出第二個答案

麻煩大家 謝謝(~^O^~) 拜託了
※ 編輯: popolin29       來自: 122.120.160.234      (11/26 10:30)
推 dxfox:下面那提選項1是不是有少  看不懂
→ dxfox:然後2的話不就是說少一個女的  那剩下還是五個男的阿
→ dxfox:我理解應該沒錯吧...
推 twlarrywu:四  三 二 一 日的數字是舉例的,你要6 7 8 9 10也可
→ twlarrywu:總之不能超過禮拜五的11 (因為它是第二多的)
→ popolin29:對選項一是少了 7/12
→ popolin29:7/12 of the remaining members were women.
→ popolin29:哈~對耶!!! 我懂了 ~感謝
→ popolin29:第二原來是我題目沒看懂~還在想說很怪~哈哈~*謝謝大家