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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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past paper?

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No.
Some other school question

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引用:
原帖由 abconqq 於 2013-10-26 04:07 PM 發表
past paper?
你識做嗎?

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