Q&A - PSLE Math

[ck123]

Question from nanyang sa1 2011 paper 2 q15

Mr Yama went shopping and bought 8 shirts from the first shop. Then, he bought 3 more identical shirts at $42.59 each from the second shop. The average cost of all his shirts was decreased by $1.50. What was the total cost of the 11 shirts?

Anyone done above question before please help cause I do not have the answer

Thanks

[tianzhu]

ck123:

Question from nanyang sa1 2011 paper 2 q15

Mr Yama went shopping and bought 8 shirts from the first shop. Then, he bought 3 more identical shirts at $42.59 each from the second shop. The average cost of all his shirts was decreased by $1.50. What was the total cost of the 11 shirts?

Hi

I believe you just want to confirm the answer.

It is $512.49

Best wishes

[ck123]

Hi tianzhu


Don’t mind to show me the steps brain a bit not working now…

Thanks

[atutor2001]

ck123:

Question from nanyang sa1 2011 paper 2 q15

Mr Yama went shopping and bought 8 shirts from the first shop. Then, he bought 3 more identical shirts at $42.59 each from the second shop. The average cost of all his shirts was decreased by $1.50. What was the total cost of the 11 shirts?

Anyone done above question before please help cause I do not have the answer

Thanks

Must first recognise that the new average price is more than the actual cost ($42.59) of a new shirt which is why the average price of the existing shirts dropped.

Since the average price dropped by $1.50, so each of the 8 shirts contributes $1.50 to the 3 new shirts.
Total amount from the 8 shirts = 8 x $1.50 = $12
This $12 is distributed equally among the 3 new shirts.
Each new shirt gets $12/3 = $4
The new average cost is higher than the cost of each new shirt by $4.
New average cost = $4 + $42.59 = $46.59

Total cost of 11 shirt = 11 x $46.59 = $512.49

[ck123]

Thanks atutor2001


Need help with this question
http://i53.tinypic.com/2jfjg38.png[/IMG] x.png[/img]

Answer given : 43.73 sqcm

Thanks

[tianzhu]

ck123:

Thanks atutor2001


Need help with this question
http://i53.tinypic.com/2jfjg38.png[/IMG] x.png[/img]

Answer given : 43.73 sqcm

Thanks

Hi

Your image is too small.

Please enlarge it.

Best wishes

[Daddy]

Hi MathIzzzfun,


Sorry to ask you some questions that I did not understand. :?

Why did the ribbons have 6 blocks instead of 3? From \"Mary bought 2/3 of ribbon\"
Why did the clips have 6 blocks also? How did you get it? Thanks..

http://i56.tinypic.com/2lwn0gw.jpg\">


Thanks.

[meimeitan]

Hi


Anyone can help to solve the Raffles Girls Maths prelimin paper 2 question 17. The answer provided is not clear. Anyone can explain how to solve it? Thanks.

[Vanilla Cake]

ck123:

Need help with this question

http://i53.tinypic.com/2jfjg38.png[/IMG] x.png[/img]
Answer given : 43.73 sqcm

tianzhu:

Your image is too small.
Please enlarge it.

http://i56.tinypic.com/25uhzpy.png\">
Dear Uncle tianzhu,

Pls refer to the above picture - Henry Park Primary School 2011 P6 Prelim Maths Paper 2 Q10 - 3 marks that ck123 was talking about. Thks for your attention in this matter.

[Vanilla Cake]

Dear Uncle tianzhu,


I got the 2011 P6 Prelim Maths paper for Rosyth School but no answers were given. I had requested vlim (her son is in Rosyth School's GEP) for her http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=48&t=157&p=581820#p581820 to provide the answers. If this is not possible, could I type the answers worked out by my younger sister for you to verify them? Just to counter check and no need any worked solutions. TIA for your attention in this request.

PS: I had browsed through this Maths paper from Rosyth School and found out that it was not an easy Maths paper.