gjooheng:

http://i57.tinypic.com/ir1hyt.jpg\">

Hi gjooheng,
:salute: :thankyou:

Really appreciate your help.
It's just that it's easier for me to understand if the position of A is on the left of P in your 1st diagram since A is going from east to west and on the right of P in your 2nd diagram since A has still not reached P yet.

Thanks for solving this!

Regards,
Xiaohu

Hi,

Need help on this question from the Add Maths 360 Ex15.4 Q16 (Rate of Change topic).

http://i57.tinypic.com/iy0bvp.png\">


Answers given:
(i) 87.2 km/h
(ii) 11.1 km/h

Thank you in advance,
Xiaohu

anneshirleygilbert:

Thank you, iwork and soseducation for all your help. I understand both methods.


Sincerely,
Anne

Hi Anne,
I just couldn't find these 2 questions in my Add maths textbook.
May I know the textbook's title and the chapter?

Thanks,
Xiaohu

anneshirleygilbert:

Can somebody help me with these 2 questions, please.


http://i62.tinypic.com/dh4b6e.jpg\">
Thank you
Anne

Hi Anne,
Can you repost? The picture is not clear, because the base of the log is not clear in both questions.

Thanks.
Xiaohu

gjooheng:

http://i59.tinypic.com/2v16q07.jpg\">

Hi gjooheng,
Thanks!! Now I know why I couldn't solve it.
I had thought that the \".\" is decimal, and not the multiplication operation \"*\".
So I had taken \"35.5\" =35 point 5, and not =35*5.

Thank you,
Xiaohu.

Hi,


Appreciate it if anyone could help solve this question from one of the S4 Add maths Prelim 2010 papers:

http://i60.tinypic.com/2mrsh80.png\">


Thank you!
Xiaohu

Glozarina:

My daughter is in Sec 1 and she's having this problem with her homework. Can someone please assist. Thanks in advance.


Mr Jackson runs a crocodile park. He estimates that 75% of male crocodiles and 78% of female crocodiles survive their first year after birth. If 49% of baby crocodiles are male, how many crocodile eggs must be hatched to ensure that 50 female crocodiles survive their first year?

Hi,
Please see if this makes sense.

Female baby crocs = 51%
Let N be the number of crocodile eggs to hatch.

N*51%*78% =50
N= 50 / (51% * 78%)
= 50 / (0.51*0.78)
= 125.7
= 126

Thanks,
Xiaohu

Thetrees123:

Thetrees123:

寻找错别字 P6


爷爷的病情见见有了起色。（渐渐）

看他垂头丧气的样子，一定是考是不及格了。（试）

你成记这么差，怎么一点都不紧张？（绩）

到底谁对谁错，我依然搞不清础。（楚）

闹钟一响，妈妈就吹促我起床准备上学。（催）

姐姐的课业十分凡重，连睡眠时间也减少了。（繁）

我隐月听到门外有人在交谈。（约）

小华一个人在课室自园自语，不知道在说什么？（言）

你为免太过分了，奶奶这么疼你，你却伤她的心。（未）

他手上握着的，近然是我遗失的手机。（竟）

爷爷刺力地走上前，把饭盒交给我。（吃）

对妈妈的付出，小华没有司毫的感动。（丝）

既然他这么有诚意，你不房帮帮他。（妨）

我们遵照老师的指示，顺力完成任务。（利）

父亲工作繁种，常常早出晚归。（重）

妈妈担心小华会寂末，因此养了一条小狗陪他。（寞）

为了应付考试，你必须牺身一些玩乐时间。（牲）

Hi Thetrees123,
Thanks!! :salute:

Xiaohu

MathIzzzFun:

Xiao Hu:

[quote=\"MathIzzzFun\"]

methods that you could use -> UP (units/parts), MD, units, algebra..

using units & cross-multiply :

In the end, after losing 32 beads,
For Alice, beads : stamps --> 8u : 5u

At first (after giving 1/3 beads to Eve),
for Alice, beads : stamps --> 8u + 32 : 5u

At first (after giving 1/3 stamps to Alice),
for Eve, beads : stamps --> 4u + 16 : 10u

Total number of beads --> 12u + 48

After Eve lost 26 stamps,
Eve's beads : stamps
--> 4u + 16 : 10u - 26
= 3 : 2

cross-multiply:
8u + 32 = 30u - 78
22u --> 110, 1u --> 5

Beads bought by Alice --> 12 x 5 + 48 = 108

cheers.

Hi MathIzzzFun,
May I know how is the \"At first, for Eve, beads : stamps --> 4u + 16 : 10u \" arrived at? The \"at first\" of Alice is worked backwards, but Eve's \"at first\" does not seem like working backwards, and I just couldn't find anything in the question that could help to arrive at this ratio.

Thanks in advance,
Xiaohu

\"at first\" - refers to the state after Alice gave 1/3 beads to Eve, and Eve gave 1/3 stamps to Alice.

At first (after giving 1/3 beads to Eve),
for Alice, beads : stamps --> 8u + 32 : 5u
.. Alice had 2/3 of the beads, Eve had 1/3 of the beads --> 1/2 x(8u+32) = 4u + 16

...Alice had 1/3 of the stamps, Eve had 2/3 of the stamps --> 2 x 5u --> 10u

So, At first (after giving 1/3 stamps to Alice),
for Eve, beads : stamps --> 4u + 16 : 10u

cheers.[/quote]Hi MathIzzzFun,
Thanks very much! I think I know now why I didn't understand your solution. It's because I had assumed wrongly, that both of them already had some beads and stamps right from the beginning before they bought some and giving away 1/3 each of what they bought.

Thanks again!
Have a good day,
Xiaohu

MathIzzzFun:

Mary Joy:

Hello Pls help me with this qn from Nanyang prelims 2013...Thanks


http://i40.tinypic.com/xc7uxv.jpg\">

methods that you could use -> UP (units/parts), MD, units, algebra..

using units & cross-multiply :

In the end, after losing 32 beads,
For Alice, beads : stamps --> 8u : 5u

At first,
for Alice, beads : stamps --> 8u + 32 : 5u

At first,
for Eve, beads : stamps --> 4u + 16 : 10u

Total number of beads --> 12u + 48

After Eve lost 26 stamps,
Eve's beads : stamps
--> 4u + 16 : 10u - 26
= 3 : 2

cross-multiply:
8u + 32 = 30u - 78
22u --> 110, 1u --> 5

Beads bought by Alice --> 12 x 5 + 48 = 108

cheers.

Hi MathIzzzFun,
May I know how is the \"At first, for Eve, beads : stamps --> 4u + 16 : 10u \" arrived at? The \"at first\" of Alice is worked backwards, but Eve's \"at first\" does not seem like working backwards, and I just couldn't find anything in the question that could help to arrive at this ratio.

Thanks in advance,
Xiaohu