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[問題] Mathematics and Problem Solving Techinques

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Mathematics and Problem Solving Techinques

(a) After collecting a group of flash cards, Harry decided to sell some of them to his friends. He sold his flash cards in the following manner:
- He sold half of the flash cards and half a card to Wayne; and then
- he sold a third of what remained and one third of a card to Jason; and then
- he sold a fourth  of what remained and one fourth of a card to Leo; and then
- he sold a fifth of what remained and one fifth of a card to Martin.
All his friends would not accept broken cards and Harry was left with 11 flash cards. How many flash cards did Harry collected initially?    (7marks)

(b)Esther and Irene started at sunrise and each walked at a constant speed. Esther walked from house A to house B whereas Irene walked from house B to house A along the same road. They met at noon and, continuing their  own journeys without stop, arrived respectively at house B at 4pm and at house at 9pm. At what time was sunrise on this day?   (4marks)

I'm so stupid. Please clearly to show me step by step.
Thank You!

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 abconqq 高級學徒 發短消息 加為好友 當前離線 2# 大 中 小 發表於 2013-10-26 04:07 PM (第 1819 天) 只看該作者 past paper? UID296900 帖子232 精華0 積分38 閱讀權限20 在線時間74 小時 註冊時間2013-1-29 最後登錄2015-8-10  查看詳細資料 TOP
 wou168168 高級學徒 發短消息 加為好友 當前離線 3# 大 中 小 發表於 2013-10-26 04:55 PM (第 1819 天) 只看該作者 No. Some other school question UID212150 帖子76 精華0 積分14 閱讀權限20 來自HK 在線時間53 小時 註冊時間2011-4-6 最後登錄2013-11-13  查看詳細資料 TOP
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past paper?

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