Tutor MathsGuru: Ask me for your burning Maths questions!

[YLH88]

Hi all,


for the below question which was asked previously in this forum,
why do we take 1u = $725, then 5u = $725 x 5 = $3625, and yet $5125 - $3265 = $1500 ? How do we get 5 sets ?

http://www.postimage.org/image.php?v=TsP8l5A

Thank you very much!

[Vanilla Cake]

YLH88:

Hi all,


for the below question which was asked previously in this forum,
why do we take 1u = $725, then 5u = $725 x 5 = $3625, and yet $5125 - $3265 = $1500 ? How do we get 5 sets ?

http://www.postimage.org/image.php?v=TsP8l5A

Thank you very much!

Alternative solutions while waiting for Mathsguru's reply:

Total spent on bags and wallets= $5850
Money spent on bags was $4400 more than money spent on wallets.
$(5850-4400)÷2=$725

B: [$725][$4400]
W:[$725]

Ann bought 5 times as many bags as wallets.

Cost of 1 unit of bag
5 units of bags x cost of 1 bag = $5125
1 unit of bag x cost of 1 bag = $1025

Cost of 1 unit of wallet
1 unit of wallet x cost of 1 wallet = $725

Value of 1 unit
Cost of 1 bag is $60 more than 1 wallet
Difference in 1 unit of bags and 1 unit of wallets = $1025-$725=$300
Difference of $300 is due to difference of $60
1 unit = $300/$60 = 5

Cost of 1 wallet
1 unit of wallet x cost of 1 wallet = $725
1 x 5 x cost of 1 wallet = $725
Cost of 1 wallet = $725÷5 = $145

OR

Number of units-quantity
Bag: 5u
Wallet: u

Value-unit cost
Bag: v+60
Wallet: v

Total amount =Number x Value
Bag: 5uv+300u
Wallet: uv

Wallet-total amount
uv = 725
5uv=3625

Bag-total amount
5uv+300u=5125
Since 5uv=3625, so 3625+300u=5125
300u=5125-3625
300u = 1500
u = 5

1 unit of wallet x cost of 1 wallet = $725
1 x 5 x cost of 1 wallet = $725
Cost of 1 wallet = $725÷5 = $145

OR

$5850-$4400=$1450
$1450÷2=$725 ->Total cost of wallets
$725+$4400=$5125-> Total cost of bags

Cost of 5 units of bags = $5125
Cost of 1 unit of bag = $5125÷5=$1025
Cost of 1 unit of wallet = $725

Difference in cost of 1 unit of bag and 1 unit of wallet =$1025-$725=$300
Difference in cost per each of bag against each of wallet = $60
Number of wallets = 300÷60=5
Cost of 1 wallet = $725÷5 = $145

[Maths Monster]

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[abc_parent]

Hi gurus,


Could you tell me how to solve the following? I appreciate any model drawings because I cannot come up with the models!

Adam has 3 times as many red stamps as Xinlong and 6 blue stamps. Cindy has 1/6 the number of red stamps that Adam has and 3 blue stamps. Cindy has 4 stamps fewer than Xinlong.
(a) How many stamps do they have altogether?
(b) How many stamps must Adam give Xinlong so that they will have the same number of stamps?

Please help!!!

[Maths Monster]

delete

[Almighty]

ksi:

Almighty:

Hi,

I dont know how to attach / draw a pic here. Anyone can help ? Meanwhile i'll type in the best way to represent the pattern. Pl.help me to solve this problem.

4 6 35 7 41 6

140 241 ?


BElow 4 and 6 is 140, below 35 and 7 is 241, below 41 and 6 is ?

Thankyou[/img]

one way is to draw on the power point, then upload to a host like http://www.photobucket.com or picasa or flickr, then link the image here.

HI Ksi,
Cannot still do it.Can u elaborate on how 2 do. I can only upload photos not drawings.It is asking for image file type. How sh i save the powerpoint file? Any help on this?

[Muffins]

Maths Monster:

abc_parent:

Hi gurus,


Could you tell me how to solve the following? I appreciate any model drawings because I cannot come up with the models!

Adam has 3 times as many red stamps as Xinlong and 6 blue stamps. Cindy has 1/6 the number of red stamps that Adam has and 3 blue stamps. Cindy has 4 stamps fewer than Xinlong.
(a) How many stamps do they have altogether?
(b) How many stamps must Adam give Xinlong so that they will have the same number of stamps?

Please help!!!

Let 6u be the number of red stamps that Adam has.

Adam has 6u + 6 stamps
Xinlong has 2u stamps
Cindy has u + 3 stamps

If Cindy has 4 stamps fewer than Xinlong, then
2u = u + 3 + 4
u = 7

a) Total number of stamps = 6u + 6 + 2u + u + 3 = 9u + 9 = 9 x 7 + 9 = 72

b) Adam has 6u + 6 = 48 stamps and Xinlong has 14 stamps.
Therefore, Adam has to give (48 - 14) /2 = 17 stamps to Xinliong so that they have the same number.

Check:

a) Xinlong has 14 stamps
Cindy has u + 3 = 7 + 3 = 10 stamps

Therefore, Cindy has 14 – 10 = 4 stamps fewer than Xinlong

b) After giving 17 stamps, Adam now has 48 – 17 = 31 stamps

After receiving 17 stamps, Xinlong now has 14 + 17 = 31 stamps



http://www.postimage.org/image.php?v=PqtDaA9

Hi Maths Monster, your answer seems right, but we do not know the amount of blue stamps that Xin Long has. But if he does not have any, then your answer is correct....

[Almighty]

These are from Andrew Er's Mathematics worksheets P6 book edition 2009:Kindly assist in these problems:

1)Has drawing-Very sorry i am not able to upload the picture:
Booklet 5 : Difficulty level 1:Qt:4:Page: 35
There are 3 dart circles.Value 9 is in the inner circle, 6 in the middle circle and 2 in the outermost circle. Eddie was given 5 darts to throw at the target. One if the darts missed the target completely. What was the highest possible even score that he could get?Ans 30.

2) Booklet 5 : Difficulty level 3:Qt: 10:Page: 21
If Lucy give $8 to Ali, he will have 5 times as much money as Lucy. If Ali gives $12 to Lucy, She will have 1/3 of the amount Ali has. How much does Ali have at first? ANs:192/- I am unable to understand the model concept used by the answer key. Kindly explain in detail.

3)Cubes question-Has drawing-Very sorry i am not able to upload the picture
Booklet 6 : Diagnostic test: qt:17:Page: 26

4)CA 2 : Section A Qt :8: Page : 21: PAttern question

5)Has drawing:Booklet 8 : Difficulty level 3: Qt : 3 : Page:18: Area n perimeter question.

6) During a sale, the price of a skirt was reduced from $256.80 to $214 inclusive of GST of 7%. What was the decrease in price of the skirt, excluding GST? Ans:40.

7) PSLE PRELIMINARY EXAMINATION 2 :PAPER 2 :qT :5:pattern qt: Ans:8

My apologies for long question request...Please help with explanations... :?:

[Muffins]

Almighty:

These are from Andrew Er's Mathematics worksheets P6 book edition 2009:Kindly assist in these problems:

1)Has drawing-Very sorry i am not able to upload the picture:
Booklet 5 : Difficulty level 1:Qt:4:Page: 35
There are 3 dart circles.Value 9 is in the inner circle, 6 in the middle circle and 2 in the outermost circle. Eddie was given 5 darts to throw at the target. One if the darts missed the target completely. What was the highest possible even score that he could get?Ans 30.

Just double both the amounts of the highest numbers e.g. 9 and 6.

[Maths Monster]

delete