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.
請詳細解釋怎樣計算

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?

Please help to calculate

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]
可以講下你做到邊度唔明?因為頭兩條數都可以用下式攪掂:

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

你記得公式,和懂的運用嗎?

[[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

可否列式給我看,我完全不明白
謝謝

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.

有130000人, 一係就係農夫, 一係就係漁夫 ...
今年年頭有 40% 人走左. (咁即係有幾多人走左?)
走左的人有 51% 係漁夫. (即係有幾多漁夫走左?)
之後漁夫的數量少左 68% ...

咁你上面果兩個問號識唔識做 ...

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]
可否列式給我看,我完全不明白
謝謝 [/quote]你唔明的是公式,還是你唔明的是題目?你要明白,你要說出你自已唔明甚麼人地才可以幫你。

[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? ...

咁呢兩題呢? ...

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

回覆 10# 的帖子

既你要test操數,那你便要學懂解題,再列式。....
那首先....題目邊句你唔明?

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
c) 計本身有幾多漁夫 (part 1 answer)
d) 計本身有幾多農夫
e) 計總共有幾多農夫走左
f) 計農夫走左的比例 (part 2 answer)

... 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
c) 計本身有幾多漁夫 (part 1 answer)
請教一教我, 5 該

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
c) 計本身有幾多漁夫 (part 1 answer)
請教一教我, 5 該 [/quote]
If the number of fishermen in the village decreased by 68% after this move.

因為我英文差, 所以我想先請你翻譯一下呢句先 . (我真係驚解錯, 唔係講笑, 雖然解錯都只係答案錯 ... 但係都無謂啦.)
之後 可以諗下下面一題
如果我食左2件 pizza , 個 pizza 比左食左 三分之一 , 咁 pizza 原本有幾多件? (因為我要收工...返屋企)

[[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

之前搬出了城市後, 在村里的漁民數量下降了68%。

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.
跟住就5識計, 可5可以教下我?

[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]]

填不盡 2014-11-20 11:23 PM

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llm3_3 2014-11-20 11:40 PM

回覆 19# 的帖子

多謝你的幫忙,現在我完全明白了,謝謝.
另外下題我也不明白點計,請賜教

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

這題也弄不清楚,請教下我,謝謝.

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?

填不盡 2014-11-21 01:38 AM

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