Q&A - PSLE Math

[Michaelia0816]

Tianzhu!


Let me give you the pictures first (with questions)
1) http://t.co/jjIIsRzK
2) http://t.co/M0piBsMo

[2DMommy]

Please help me to solve these two questions :


1) There are 200 red buttons and 90 green buttons in Box A.
There are 80 red buttons and 100 green buttons in Box B.
Find the total number of buttons that must be transferred from Box A to Box B so that 1/2 of the buttons in Box A and 3/5 of the buttons in Box B are red buttons?

2)On Friday, some identical chairs in a shop were sold at $45 each.
On Saturday, the price of the chairs were reduced. As a result, the number of chairs sold increased by 50% while the amount of money collected increased by 25%.
a) Find the price of a chair sold on Saturday.
b) Find the percentage decrease in the price of a chair sold on Saturday.

Thank you.

[tianzhu]

Michaelia0816:

Tianzhu!


Let me give you the pictures first (with questions)
1) http://t.co/jjIIsRzK
2) http://t.co/M0piBsMo

Hi

For the first question,the answer is (3)

A,M and E

For the second question, the answer is (4)

Angle ABC ---- 180-18 ----- 162

Angle ABE ----- 360 -162 – 60 -----138

Triangle ABE is isosceles.

Angle AEB ------- (180 – 138)/2 ------ 21

Best wishes

[tianzhu]

Winx5015:

http://i48.tinypic.com/t6qe6e.jpg\">

Hi

Where is this question from?It's difficult to read.

Could we have a link to it if it is from the past year papers?

Best wishes

[tianzhu]

2DMommy:

Please help me to solve these two questions :


1) There are 200 red buttons and 90 green buttons in Box A.
There are 80 red buttons and 100 green buttons in Box B.
Find the total number of buttons that must be transferred from Box A to Box B so that 1/2 of the buttons in Box A and 3/5 of the buttons in Box B are red buttons?

Hi

This question touches on SE.

You may use MD, UP or use letters of the alphabet to show the variables.

Due to time constraints, I’ll just provide some pointers using UP.

At first

Bag A

R:G ------ 200:90

Bag B

R:G ------ 80:100

After the transfer

Bag A

R:G ------ 1u:1u

Bag B

R:G ------ 3p:2p

1u + 3p ------- 280 (200 + 80)

1u + 2p ------ 190 (90 + 100)

1p ------ 90

After the transfer
Bag B

R:G ------ 270:180

Red ------- 270 – 80 ------ 190

Green ----- 180 - 100 ------ 80

Total -------- 270

Best wishes

[tianzhu]

2DMommy:

2)On Friday, some identical chairs in a shop were sold at $45 each.
On Saturday, the price of the chairs were reduced. As a result, the number of chairs sold increased by 50% while the amount of money collected increased by 25%.
a) Find the price of a chair sold on Saturday.
b) Find the percentage decrease in the price of a chair sold on Saturday.

Hi

You may use MD.

Draw 2 boxes to show number of chairs sold on Friday.

To show value, represent each box by 45 units.

Draw 3 boxes for the number of chairs sold on Saturday.

Amount collected increased by 25% ------ 112.5

112.5/3 ------ 37.5 (cost of a chair on Sat)

% decrease ------- 7.5/45*100% ------- 16.67%

Best wishes

[Michaelia0816]

tianzhu:

Winx5015:

http://i48.tinypic.com/t6qe6e.jpg\">

Hi

Where is this question from?It's difficult to read.

Could we have a link to it if it is from the past year papers?

Best wishes

I do the screenshot for this question and made it bigger, sorry that I cannot scan, but can tweet, this is the website,

http://t.co/A26DlIPp

It is readable as I added enhance on in it! Now, you can read, Tianzhu!

[Michaelia0816]

Thx for the two questions!

[Essential]

Tianzhu thank you for helping … Aiyo my poor boy struggling … PSLE soon yet seems a lot of question unsure the concept

[MapleSyrup]

Plank A -> 360 cm (I can't really see clearly)


10 equal parts -> 360 cm
1 equal part -> 36 cm

Between W and X, there are 8 equal parts.
8 equal parts -> (36 x cm = 288 cm


Plank B

6 equal parts -> 288 cm
1 equal part -> 48 cm

8 equal parts -> (48 x cm = 384 cm (Plank B) :imcool: