Q&A - PSLE Math

[kiasuaunt]

:thankyou: Zhu99 for your clear explanation. I understand now.

[zanen]

Zhu99:

zanen:

hello. can someone help me? please help me...both my tuition teachers refuse to...:( some boys sat in a circle. 41 fruit tarts were passed around the boys. alan happened to receive the first and last fruit tarts he received a total of 6fruit tarts. how many boys are there?

41 - 1 = 40 --- Disregard the 1st fruit tart Alan received

6 - 1 = 5 --- Number of rounds

40/5 = 8 --- No. of boys

There are 8 boys.

Alan --- 1st, 9th, 17th, 25th, 33th, 41st

may you explain to me why must disregard the lst one by alan?

[nounou]

Hi Tianzhu, can you please explain the following?


146 – (1+2) ------143 (71 and 72)
Why – (1+2)? Why -? Why 1? Why +2? :gloomy:
:udaman: :thankyou:

tianzhu:

Treelodge:

Q15 part 2. Uncle Tianzhu, you have lao hua ah?

Hi

I've to admit I cannot resist the onslaught of old age.

Try to enlarge your images in the future so that we can see better.

The numbers on one side of a sheet adds up to 146.

bi ------21,22 and 51,52

146 – (1+2) ------143 (71 and 72)

Hence number of photos -------- 72

Best wishes

[MathIzzzFun]

Clairifina:

Hi, can somebody please help with this question? It will be much appreciated. Thank you in advance!


Store X sells an ipad at $660 which is 20% more than the price at store Y. During The Great Singapore Sale, both stores offered the same percentage discount for the iPad. Mr Lee bought the iPad from store Y and paid $104.50 less than the discounted price at store X. What is the percentage discount?

20/120 x $660 = $110 --> Price of the ipad at Store X is $110 more than that at Store Y.

$104.50/$110 x100% =95%
Discount -->100%-95% = 5%

cheers.

[MathIzzzFun]

Treelodge:

Q15 part 1 http://i48.tinypic.com/1gmxiw.jpg\">

tianzhu:

[quote=\"Treelodge\"]http://i48.tinypic.com/11t9wz6.jpg\"> Very pai seh! :imsorry: Another Q from Nanyang Prelim 2012. Q15. :gloomy: Someone please tell (lie to) me actual PSLE Maths is not that difficult.
How to do bi and bii? Answers given bi=21, 22, 51,52 bii=72
:thankyou: :thankyou: :thankyou: [img]

Hi

Could we have a clearer image, please?

Best wishes

[/quote]suppose we have a 60 page newspapers --> page number of 1st page + page number on last page = 1 + 60 = 61 --> total number of pages = 61-1=60

applying the same concept here..we have
on the sheet given, the photo numbers are 21, 22 & 51, 52
21+52= 73
22+51= 73
Total number of photos = 73-1 = 72

cheers

[nounou]

Please help to solve this Q. RGS prelim 2012 Q14. :yikes: :?: :imdrowning:

:thankyou: :thankyou: :thankyou:

http://i46.tinypic.com/op8bk5.jpg\">

[tianzhu]

Treelodge:

Hi Tianzhu, can you please explain the following?

146 – (1+2) ------143 (71 and 72)
Why – (1+2)? Why -? Why 1? Why +2?

Hi

The numbers on one side of a sheet adds up to 146.

1 and 2 refers to photo number 1 and photo number 2.

Photo number 71 and 72 are also on the same side of the sheet as photo 1 and 2.

143 ------ 71 + 72 (consecutive numbers)

Best wishes

[kiasuaunt]

:thankyou: charsen.

[MathIzzzFun]

Treelodge:

Please help to solve this Q. RGS prelim 2012 Q14. :yikes: :?: :imdrowning:

:thankyou: :thankyou: :thankyou:

http://i46.tinypic.com/op8bk5.jpg\">

Case 1:
Saw into same number of pieces, Log A : Log B -> 1.2 : 0.9 = 4 : 3 -> 32u : 24u
Length of Log A -> 32u
Length of Log B -> 24u + 0.9m

Case 2:
Saw into same number of pieces, Log A : Log B -> 1.6 : 1.25 = 32u : 25u
Length of Log A -> 32u
Length of Log B -> 25u + 0.6m

Length of Log B is same in both cases :
24u + 0.9 m = 25u + 0.6m
1u -> 0.3m

Length of Log A -> 32 x 0.3 m = 9.6m

cheers.

[nounou]

You are so efficient! Many thanks! :rahrah: :boogie: :lovesite: :thankyou: :thankyou: :thankyou: :udaman:

MathIzzzFun:

Treelodge:

Please help to solve this Q. RGS prelim 2012 Q14. :yikes: :?: :imdrowning:
:thankyou: :thankyou: :thankyou:

http://i46.tinypic.com/op8bk5.jpg\">

Case 1:
Saw into same number of pieces, Log A : Log B -> 1.2 : 0.9 = 4 : 3 -> 32u : 24u
Length of Log A -> 32u
Length of Log B -> 24u + 0.9m

Case 2:
Saw into same number of pieces, Log A : Log B -> 1.6 : 1.25 = 32u : 25u
Length of Log A -> 32u
Length of Log B -> 25u + 0.6m

Length of Log B is same in both cases :
24u + 0.9 m = 25u + 0.6m
1u -> 0.3m

Length of Log A -> 32 x 0.3 m = 9.6m

cheers.

:thankyou: