Q&A - PSLE Math

[fanren]

- deleted -

[fxchow]

Hi,


Please help on this P6 math. TIA
If David after giving 1/3 of his money to Ken, Ken will have $70 more than David.
If David after giving 1/5 of his money to Ken, Ken will have $10 money than David. How much does David have initially?

[MathIzzzFun]

fxchow:

Hi,


Please help on this P6 math. TIA
If David after giving 1/3 of his money to Ken, Ken will have $70 more than David.
If David after giving 1/5 of his money to Ken, Ken will have $10 money than David. How much does David have initially?

At first, David --> 15 units (LCM of 3 & 5)

IF David give 1/3 (=5 units) to Ken,
David --> 10 units
Ken --> 10 units + $70
Ken, at first --> 5 units + $70

If David give 1/5 (=3 units) to Ken,

David --> 12 units
Ken --> 8 units + $70

Ken will have $10 more than David

so, 8 units + $70 = 12 units + $10
1 unit --> $15

At first, David --> 15 x $15 = $225

cheers.

[fxchow]

MathIzzzFun:

fxchow:

Hi,


Please help on this P6 math. TIA
If David after giving 1/3 of his money to Ken, Ken will have $70 more than David.
If David after giving 1/5 of his money to Ken, Ken will have $10 money than David. How much does David have initially?

At first, David --> 15 units (LCM of 3 & 5)

IF David give 1/3 (=5 units) to Ken,
David --> 10 units
Ken --> 10 units + $70
Ken, at first --> 5 units + $70

If David give 1/5 (=3 units) to Ken,

David --> 12 units
Ken --> 8 units + $70

Ken will have $10 more than David

so, 8 units + $70 = 12 units + $10
1 unit --> $15

At first, David --> 15 x $15 = $225

cheers.

Hi MathIzzzFun,

Thanks for you reply.

I still can't figure out the below statement.

8 units + $70 = 12 units + $10

Why 12 units + $10? and why both side is equal?

Sorry for so many questions.

[MathIzzzFun]

fxchow:

MathIzzzFun:

[quote=\"fxchow\"]Hi,


Please help on this P6 math. TIA
If David after giving 1/3 of his money to Ken, Ken will have $70 more than David.
If David after giving 1/5 of his money to Ken, Ken will have $10 money than David. How much does David have initially?

At first, David --> 15 units (LCM of 3 & 5)

IF David give 1/3 (=5 units) to Ken,
David --> 10 units
Ken --> 10 units + $70
Ken, at first --> 5 units + $70

If David give 1/5 (=3 units) to Ken,

David --> 12 units
Ken --> 8 units + $70

Ken will have $10 more than David

so, 8 units + $70 = 12 units + $10
1 unit --> $15

At first, David --> 15 x $15 = $225

cheers.

Hi MathIzzzFun,

Thanks for you reply.

I still can't figure out the below statement.

8 units + $70 = 12 units + $10

Why 12 units + $10? and why both side is equal?

Sorry for so many questions.[/quote]
http://i50.tinypic.com/2hyuz9w.png\">

cheers.

[fxchow]

Hi MathIzzzFun,


I got it now. Thank you for your clear picture.

[Mary Joy]

Hi…I have a doubt in an Angle sum but can’t understand if i just write here without a picture. Anybody pls. highlight any chance i can attach an image here.? If so pls. explain how to attach an image so that draw the angle & post here.Thanks.

[MathIzzzFun]

Mary Joy:

Hi..I have a doubt in an Angle sum but can't understand if i just write here without a picture. Anybody pls. highlight any chance i can attach an image here.? If so pls. explain how to attach an image so that draw the angle & post here.Thanks.

Click on \"Post Reply\" at the end of the last post to go into the edit/post mode.

scroll down the screen and you will see the \"tinypic\" plugin.. attach your picture file (in image format - jpg, png, bmp), resize image size to \"message board\" -- click upload and then add to post.

cheers.

[Mary Joy]

MathIzzzFun:

Mary Joy:

Hi..I have a doubt in an Angle sum but can't understand if i just write here without a picture. Anybody pls. highlight any chance i can attach an image here.? If so pls. explain how to attach an image so that draw the angle & post here.Thanks.

Click on \"Post Reply\" at the end of the last post to go into the edit/post mode.

scroll down the screen and you will see the \"tinypic\" plugin.. attach your picture file (in image format - jpg, png, bmp), resize image size to \"message board\" -- click upload and then add to post.

cheers.

Hi Mathizzfun...Thanks for the feedback.

[Mary Joy]

Hi…Pls. help me to find out the answer.


The figure below is not drawn to scale.CDEF is a trapezium and AB=BC.
<EFC is twice of <FCA. BCD is a right angled triangle.

a) Find <FCD
b) Find <DBA