Q&A - PSLE Math

[tianzhu]

Hi


Hope this helps.

Best wishes.

http://farm5.static.flickr.com/4110/5040921702_62e5e15797_b.jpg\">

[PuzzledboutTHISandTHAT]

There are two bags of stones labelled A and B. In Bag A, there are 350 black stones and 500 white stones. In Bag B, there are 400 black stones and 100 white stones. How many black and white stones should be transferred from bag B to bag A so that 50%of the stonesin bagA and 75%of those in bagB are black? :Can you do the model method?Thks...

[tianzhu]

PuzzledboutTHISandTHAT:

There are two bags of stones labelled A and B. In Bag A, there are 350 black stones and 500 white stones. In Bag B, there are 400 black stones and 100 white stones. How many black and white stones should be transferred from bag B to bag A so that 50%of the stonesin bagA and 75%of those in bagB are black? :Can you do the model method?Thks...

Hi

Your question is similar to one of the earlier posts in this thread.

This question has two unknowns and one is required to use simultaneously equation(SE) to solve it. If a student is comfortable with SE, he/she may use it.

I’ll share how to solve SE with visual representation.

The numbers in the earlier question are different but you should be able to solve your question with the same strategy.

Best wishes.

http://farm5.static.flickr.com/4122/4778205021_8f7608186f_b.jpg\">

[octopusmum]

Hi kancheongmum and tianzhu

Tks for your help, hope there won’t be such questions in psle next week!

[tianzhu]

octopusmum:

Hi kancheongmum and tianzhu

Tks for your help, hope there won't be such questions in psle next week!

Hi

You're welcome.

Best wishes

[abc_parent]

hey Vanilla Cake

all the best for your exams too!

[tianzhu]

Hi


Ali,Bala and charles shared a tin of cookies. Ali took 5/6 of the tin of cookies and 1/3 of a cookie. Bala took 5/6 of the remaining tin of cookies and 1/3 of a cookie. Charles received only 2 cookies. How many more cookies did Ali have than Bala?

Q17 from Rosyth CA1 2009, the answer given in the WS is 60.
Please help to confirm if it is correct.

Best wishes

[Vanilla Cake]

tianzhu:

Hi


Ali,Bala and charles shared a tin of cookies. Ali took 5/6 of the tin of cookies and 1/3 of a cookie. Bala took 5/6 of the remaining tin of cookies and 1/3 of a cookie. Charles received only 2 cookies. How many more cookies did Ali have than Bala?

Q17 from Rosyth CA1 2009, the answer given in the WS is 60.
Please help to confirm if it is correct.

Best wishes

Hi Tianzhu,

This question was first posted by http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=6373&postdays=0&postorder=asc&start=790 on Mon Apr 12, 2010 8:43 am.
It had been answered by http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=6373&postdays=0&postorder=asc&start=790 on Mon Apr 12, 2010 9:02 am
and
http://www.postimage.org/image.php?v=gxxlNRS on 12 Apr 2010 13:12

VC's mum

[tianzhu]

Hi VC’s mum


Thank you for your reply.

It really jolted my memory.

What a strange thing to do? I’ve actually answered this question when your daughter requested for it.It’s on pg 138 of this thread.

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=280&postdays=0&postorder=asc&start=1370

Well, I’ve to admit I am getting old.

Best wishes

[the kiasu student]

hi all,


My teacher gave us another question again.

At a fitness carnival,1600 people participated in a Mass Dance and Taiji. 30% of the Mass dance participants were adults. 40% of the Taiji participants were children. During a break, some Mass Dance participants went to join Taiji and some Taiji participants went to join the Mass Dance. After the change, 25% of the Mass Dance participants and 75% of the Taiji participants were adults. How many Mass Dance participants were there after the change?


I could not make 1 unit of Taiji & Mass Dance participants the same. Please help! :stupid: :udawoman: :udaman: :clubmyself: :lovesite: :dancing: :boogie: