Q&A - PSLE Math

[ck123]

Hi all


I am having problem uploading the pictures for RGS 2011 Prelim Paper 1 Q27 and Paper 2 Q17. Anyone have the solutions? Please help.

Thanks

[tianzhu]

ozora:

now i tried it on the this following question: but i got stuck. can U see where i go wrong?
Ashley and Bee shared a sum of money. If Ashely spend $10 each day and Bee spend $20 each day, Ashely would have $250 left while Bee would have spend all her money. If Ashely spend $20 each day and Bee spend $10 each day, Ashely would have $10 left while Bee would have spend all her money. How much money did they have resepctively?

Case 1:
A -1 unit +250
B- 2 units
Assuming 1 unit - $10

case 2:
A- 3 unit +10
B- 2 units

2 units= 250-10 =240
1unit -120
a- 360
the answer is wrong.

Hi

There is an error as highlighted. It should be read as 4 units + 10

1 unit ---- 80

Ashley ----- 330
Bee ----- 160

Best wishes

[Daddy]

Thanks alot MathIzzzFun.

:thankyou:

[Vanilla Cake]

ck123:

I am having problem uploading the pictures for RGS 2011 Prelim Paper 1 Q27 and Paper 2 Q17. Anyone have the solutions? Please help.

http://i53.tinypic.com/15cy9k.png\">
Answer given: 91.4 cm

http://i51.tinypic.com/x1n6zl.png\">
Answer given: (a) 138.06 cm2 (b) ~83.91 cm

Pls wait for Uncle tianzhu / MathIzzzFun to provide worked solutions.
Thks.

[ck123]

:thankyou: vanilla cake


How did you manage to attach the picture?

[Daddy]

Thanks MathIzzzFun

[/quote]
Q2.

http://i56.tinypic.com/2mgwklt.jpg\">

cheers.[/quote]

How did you get 3: 2 ratio of Mary to John?
How about John bought 40% of the totalnumber of clips and ribbons?

I am not quiet understand. Sorry for that.

[tianzhu]

Hi


Hope this helps.

Best wishes.

http://farm7.static.flickr.com/6196/6126196951_0dc89c875a_z.jpg\">

[michyms]

tianzhu:

ozora:

now i tried it on the this following question: but i got stuck. can U see where i go wrong?
Ashley and Bee shared a sum of money. If Ashely spend $10 each day and Bee spend $20 each day, Ashely would have $250 left while Bee would have spend all her money. If Ashely spend $20 each day and Bee spend $10 each day, Ashely would have $10 left while Bee would have spend all her money. How much money did they have resepctively?

Case 1:
A -1 unit +250
B- 2 units
Assuming 1 unit - $10

case 2:
A- 3 unit +10
B- 2 units

2 units= 250-10 =240
1unit -120
a- 360
the answer is wrong.

Hi

There is an error as highlighted. It should be read as 4 units + 10

1 unit ---- 80

Ashley ----- 330
Bee ----- 160

Best wishes

tianzhu, can you explain how you assigned the units? I'm a little confused. Thanks.

[tianzhu]

Hi


A quick one for Q17, sorry no time to draw now.

You need to do some rearrangement of figures

Radius of semi circle ---- 11.75 cm.

Area of two squares ----- 11.7511.75 -----138.06sqcm

Breadth of rectangle ----- same as radius of semi circle ------11.75

Length of rectangle -----11.752

Perimeter of S and T ------ circumference of semi circle + (11.754) ------(pi11.75) + 47 ------83.91cm

(use calculator pi)

Best wishes

[ck123]

:thankyou: tianzhu


Can u help to explain how to see Radius of semi-circle is 11.75 :scratchhead: for Q17

How about RGS 2011 Prelim Paper 2 Question 14b and 15.

You are great :udaman: