Q&A - PSLE Math

[MathIzzzFun]

TT2:

Hi I have another qn to ask...


In Jan, 80% of the members in a golf club were men. In jun, after 55 men had left and 75 women had joined the club, the % of the women increased to 40%. How many members were there in the golf club in Jan?

Thank you

Hi

In Jan, ratio of men : women : 80:20 = 4u:1u ** total 5u
after 55 men left, and 75 women joined,
ratio of men : women
= 4u - 55 : 1u + 75
= 60 : 40
= 3 : 2

so, 8u - 110 = 3u + 225
5u = 335

Members in Jan = 5u = 335

cheers.

[stary]

Thanks MathIzzzFun for your prompt reply!

[Daddy]

Hi,


Need help on this question? Thanks

John had 1.5m of copper wire. He cut some of the wire to bend into the shape shown in the figure below. In the figure, there are 6 equilateral triangles and the length of XY is 19 cm. How much of the copper wire was left?

http://i55.tinypic.com/a2q0rs.jpg\">

Thanks

[stary]

Daddy:

Hi,


Need help on this question? Thanks

John had 1.5m of copper wire. He cut some of the wire to bend into the shape shown in the figure below. In the figure, there are 6 equilateral triangles and the length of XY is 19 cm. How much of the copper wire was left?

http://i55.tinypic.com/a2q0rs.jpg\">

Thanks

Hi!

Used -> 5 x 19 = 95cm
Left -> 150cm - 95cm =55cm

Best Regards

[TT2]

Hi MathIzzzfun,


Thanks for your help. Noticed that e cross-multiply way is sometimes used to solve e ratio problems n sometimes e model method can be used. My son is not familiar on e 1st method. When do we use e cross multiply method or die die must use this? Eg. There is movement of e items???? :? Pls help...... :imdrowning:

Thanks a lot

[christina soh]

TT2:

Hi MathIzzzfun,


Thanks for your help. Noticed that e cross-multiply way is sometimes used to solve e ratio problems n sometimes e model method can be used. My son is not familiar on e 1st method. When do we use e cross multiply method or die die must use this? Eg. There is movement of e items???? :? Pls help...... :imdrowning:

Thanks a lot

Hi MathIzzzFun,

What is your answer for Q14 of Paper 1 (math) of the following school?

http://www.orlesson.org/orp/09Ma/2009-P6-Math-SA2-PLMGS.pdf

[MathIzzzFun]

TT2:

Hi MathIzzzfun,


Thanks for your help. Noticed that e cross-multiply way is sometimes used to solve e ratio problems n sometimes e model method can be used. My son is not familiar on e 1st method. When do we use e cross multiply method or die die must use this? Eg. There is movement of e items???? :? Pls help...... :imdrowning:

Thanks a lot

Hi

I will post the model solution later.. in a rush now.. and also the cross multiply method.

cheers.

[spunky]

SCGS SA2 2009


Can someone please help me with this question:
Ahmad and Halim together took 5 days to paint their house. If Ahmad and Halim work together for 2 days, followed by Ahmad working alone for 8 days, Halim will take 1 more day to complete the remaining work. How long will Ahmad take to apint the house all by himself?

Thanz

[MathIzzzFun]

christina soh:

TT2:

Hi MathIzzzfun,


Thanks for your help. Noticed that e cross-multiply way is sometimes used to solve e ratio problems n sometimes e model method can be used. My son is not familiar on e 1st method. When do we use e cross multiply method or die die must use this? Eg. There is movement of e items???? :? Pls help...... :imdrowning:

Thanks a lot

Hi MathIzzzFun,

What is your answer for Q14 of Paper 1 (math) of the following school?

http://www.orlesson.org/orp/09Ma/2009-P6-Math-SA2-PLMGS.pdf

Hi

77 blocks... the blocks need not be oriented in the same way..

cheers.

[christina soh]

MathIzzzFun:

christina soh:

[quote=\"TT2\"]Hi MathIzzzfun,


Thanks for your help. Noticed that e cross-multiply way is sometimes used to solve e ratio problems n sometimes e model method can be used. My son is not familiar on e 1st method. When do we use e cross multiply method or die die must use this? Eg. There is movement of e items???? :? Pls help...... :imdrowning:

Thanks a lot

Hi MathIzzzFun,

What is your answer for Q14 of Paper 1 (math) of the following school?

http://www.orlesson.org/orp/09Ma/2009-P6-Math-SA2-PLMGS.pdf

Hi

77 blocks... the blocks need not be oriented in the same way..

cheers.[/quote]Thank you very much MathIzzzFun. Would you mind let me have the working?