Q&A - PSLE Math

[Dharma]

youngmum:

Hi, can help me solve these 2 questions pls. They are in my boy homework. Thanks.



Q1

When Mrs Lee was 40 years old, her son was twice her daughter's age. Mrs Lee will be twice her son's age when her daughter is 28 years old. How old will Mrs Lee be when her daughter is 20 years old? (56 years old)

Hope this helps
http://www.postimage.org/

[N3SKiasu]

tianzhu:

Hi

I don't get what you meant by some of the picture/slides posted (by Dharma) didn't show up.

But, if you want to copy his slides on document(say using MS Word), just place mouse's arrow over selected slide, do a right click and select copy.Then paste into your Word document.

Hope I've addressed your concern.

Best Wishes

Thanks Tianzhu for your reply.

I managed to find out why I could not see the pictures posted by all earlier. It was due to the K9 web protection software (I found this software via recomm in KSP), it stopped some images web page that might contain inappropraite images for children. It is fine now after I have allowed assess to this imaging web page. Kind of strict from this software but it works well for children!

Btw, I salute your efforts in taking the time to solve so many problem sums and science questions with your child...I have been trying to follow the speed this topic grow but couldn't catch up...while your wife may have some comments...I wld rather my husband to draw model than watching his TV prog all the times. :x Perhaps he prefers to draw the model of the lady figure in the show than the complicated Maths model

[N3SKiasu]

Hi all, I tried to search if the following question has been asked and solved before under this topic but could not find. Kindly help:

Rosyth Prelim 2008 Q47
Siew Leng paid $8.56 for some 26-cent, 30-cent and 50-cent stamps.
She bought 4 more 30-cent stamps than 50-cent stamps.
There were twice as many 26-cent stamps as 30-cent stamps.
How many 26-cent stamps did she buy?
(ans given is 16).

Thanks in advance.

[Dharma]

N3SKiasu:

Hi all, I tried to search if the following question has been asked and solved before under this topic but could not find. Kindly help:

Rosyth Prelim 2008 Q47
Siew Leng paid $8.56 for some 26-cent, 30-cent and 50-cent stamps.
She bought 4 more 30-cent stamps than 50-cent stamps.
There were twice as many 26-cent stamps as 30-cent stamps.
How many 26-cent stamps did she buy?
(ans given is 16).

Thanks in advance.

http://www.postimage.org/

[enoawng]

Can any help?


There were 186 adults in an auditorium. When 7/12 of the men and 4/9 of the women left the auditorium, the total number of adults who remained became 90. How many men were there in the auditorium at first?

[James Ang]

enoawng:

Can any help?


There were 186 adults in an auditorium. When 7/12 of the men and 4/9 of the women left the auditorium, the total number of adults who remained became 90. How many men were there in the auditorium at first?

let me try;

12/12 - 7/12 = 5/12 of men left behind
9/9 - 4/9 = 5/9 of women left behind

5/12 of men and 5/9 of women = 90
1/12 of men and 1/9 of women = 18
9/12 of men and 9/9 of men = 18x9 = 162
3/12 of men = 186 -162 = 24
12/12 of men = 24 x 4 = 96 men.

There are 96 men in the auditorium at first.

[James Ang]

try this


Jack bought some pens and erasers for a total of $100.10. He spent $9.10 more on the pens than erasers. Each pen cost $3.70 more than each eraser. Jack bought 6 times more erasers than pens. How much does a pen cost?

[3greatkids]

James Ang:

try this


Jack bought some pens and erasers for a total of $100.10. He spent $9.10 more on the pens than erasers. Each pen cost $3.70 more than each eraser. Jack bought 6 times more erasers than pens. How much does a pen cost?

hmmm the numbers are all correct?

[Dharma]

3greatkids:

James Ang:

try this


Jack bought some pens and erasers for a total of $100.10. He spent $9.10 more on the pens than erasers. Each pen cost $3.70 more than each eraser. Jack bought 6 times more erasers than pens. How much does a pen cost?

hmmm the numbers are all correct?

http://www.postimage.org/

http://www.postimage.org/

[James Ang]

a P4 question to share.



Mrs Ang has some children. Each of her daughters has twice as many brothers as sisters. Each of her sons has the same number of brothers as sisters. How many daughters does Mrs Ang have?