# 查看完整版本 : Percentage change

llm3_3 2014-11-20 03:46 PM

## Percentage change

There are originally 130000 villagers in A village and they are either farmers or fishermen. At the beginning of this year，40% of the villagers moved out to the city，of which 51% are fishermen. If the numbet of fishermen in the village decreased by 68% after this move.
1/ find the original numbrt of fishermen in the village
2/ find the % change in the numbet of farmers in the village.

llm3_3 2014-11-20 03:52 PM

## Form 3 maths

An MP3 player and a notebook are sold for \$5402 in total. The MP3 player is soldb at a percentage loss of 20%，while the notebok is sold at a percentage loss of 28%. If the loss of selling the MP is \$185.
1/ what are the respective costs of the MP3 player and the notebook？
2/ what is the total percentage loddbod selling these two products？

llm3_3 2014-11-20 03:57 PM

## Maths question

Tom deposits the same amount of money each in two banks，both at an interest rate of 5% p.a. If one bank pays simple interest while the other compounds interest yearly， the compound interest will be \$100 more than the simple interest  after 2 years.

Find the principal deposited in total？

[7] 2014-11-20 04:38 PM

[quote]原帖由 [i]llm3_3[/i] 於 2014-11-20 03:46 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=402897713&ptid=24047828][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
There are originally 130000 villagers in A village and they are either farmers or fishermen. At the beginning of this year，40% of the villagers moved out to the city，of which 51% are fishermen. If t ... [/quote]

[img]http://sciencesoft.at/lpng/586c8fd7d3db844257a4137b149a7a912d37efe.png&size=100*[/img]

[[i] 本帖最後由 [7] 於 2014-11-20 04:45 PM 編輯 [/i]]

llm3_3 2014-11-20 04:46 PM

## 回覆 4# 的帖子

plusman123 2014-11-20 05:12 PM

There are originally 130000 villagers in A village and they are either farmers or fishermen. At the beginning of this year，40% of the villagers moved out to the city，of which 51% are fishermen. If the number of fishermen in the village decreased by 68% after this move.

llm3_3 2014-11-20 05:17 PM

## 回覆 6# 的帖子

3 條數學都不識做，請教一教我，5該

[7] 2014-11-20 05:18 PM

[quote]原帖由 [i]llm3_3[/i] 於 2014-11-20 04:46 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=402901309&ptid=24047828][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]

[7] 2014-11-20 05:21 PM

[quote]原帖由 [i]llm3_3[/i] 於 2014-11-20 05:17 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=402903121&ptid=24047828][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
3 條數學都不識做，請教一教我，5該 [/quote]唔識甚麼，係唔明題目？唔識入手？中間有地方cake住？忘記公式？唔識列式？定係其他？

llm3_3 2014-11-20 05:22 PM

## 回覆 8# 的帖子

2樣都5明，因為要test,想操下數，但這幾題也想不到點計

plusman123 2014-11-20 05:28 PM

... 如果我有 12 粒糖, 比左一半你, 咁我比左幾多粒你? ...
... 如果我有 12 粒糖, 比左50%你, 咁我比左幾多粒你? ...

[7] 2014-11-20 05:29 PM

## 回覆 10# 的帖子

plusman123 2014-11-20 05:39 PM

## 回覆 7# 的帖子

... 第一題基本上你要做6樣野 ...
a) 計總共有幾多人走左
b) 計總共有幾多漁夫走左
d) 計本身有幾多農夫
e) 計總共有幾多農夫走左

... 咁我想問, 你係上面某個步驟唔識計, 定係唔知要呢D步驟先計到個答案? ...

[[i] 本帖最後由 plusman123 於 2014-11-20 05:42 PM 編輯 [/i]]

llm3_3 2014-11-20 05:44 PM

## 回覆 13# 的帖子

Part a & b 我明白點計
a) 計總共有幾多人走左
b) 計總共有幾多漁夫走左

Part C開始就 不明白點計

plusman123 2014-11-20 05:47 PM

[quote]原帖由 [i]llm3_3[/i] 於 2014-11-20 05:44 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=402904569&ptid=24047828][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
Part a & b 我明白點計
a) 計總共有幾多人走左
b) 計總共有幾多漁夫走左

Part C開始就 不明白點計

If the number of fishermen in the village decreased by 68% after this move.

[[i] 本帖最後由 plusman123 於 2014-11-20 05:49 PM 編輯 [/i]]

llm3_3 2014-11-20 05:53 PM

## 回覆 15# 的帖子

llm3_3 2014-11-20 06:02 PM

## 回覆 8# 的帖子

There are originally 130000 villagers in A village and they are either farmers or fishermen. At the beginning of this year，40% of the villagers moved out to the city，of which 51% are fishermen. If t ...

130000 x 40% x 51% = 26520 (no. of fishermen moved to city)

If the number of fishermen in the village decreased by 68% after this move.

[7] 2014-11-20 06:19 PM

[quote]原帖由 [i]llm3_3[/i] 於 2014-11-20 06:02 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=402905603&ptid=24047828][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
There are originally 130000 villagers in A village and they are either farmers or fishermen. At the beginning of this year，40% of the villagers moved out to the city，of which 51% are fishermen. If t ... [/quote]Then we use the formula:
New value=original value x (1+%change)
Now , original number of fishman is that u want to find.
New value = 26520
% change =-68%

So how is it be sub. into the formula, and how is it solved?

[[i] 本帖最後由 [7] 於 2014-11-20 06:21 PM 編輯 [/i]]

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llm3_3 2014-11-20 11:40 PM

## 回覆 19# 的帖子

An MP3 player and a notebook are sold for \$5402 in total. The MP3 player is soldb at a percentage loss of 20%，while the notebok is sold at a percentage loss of 28%. If the loss of selling the MP is \$185.
1/ what are the respective costs of the MP3 player and the notebook？
2/ what is the total percentage loss of selling these two products？

llm3_3 2014-11-20 11:42 PM

## 回覆 19# 的帖子

Tom deposits the same amount of money each in two banks，both at an interest rate of 5% p.a. If one bank pays simple interest while the other compounds interest yearly， the compound interest will be \$100 more than the simple interest  after 2 years.

Find the principal deposited in total？

*** 作者被禁止或刪除 內容自動屏蔽 ***