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[Hifive]

Hi everyone


Need help with this question - P5 level:

The ratio of $5-notes to 20-cent coins in Mr Tan’s counter was 19:5. Mr Tan exchanged 15 of his $5-notes for some 20-cent coins. The ratio of the $5-notes to 20-cent coins then became 1:5. What was the total value of $5-notes and 20-cent coins at first?

Thank you in advance.

[corneyAmber]

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... :?:

Almighty, you know how to upload photo?
maybe you can use the camera to snap a shot and then upload the jpg file onto hosting site, this can do too......then using the tags to post it here.

[Vanilla Cake]

abc_parent:

Q4) ABCD is a rectangle. The area of triangle ABE is 80cm2. The area of triangle CDE is 30% of the area of rectangle ABCD.

Find the area of rectangle ABCD.

Area of ΔABE+Area of ΔCDE=Area of ΔAED+Area ofΔEBC
Since ΔABE&ΔCDE have common base and ΔAED&ΔEBC have common base.

Area of ΔABE+Area of ΔCDE=50% of Area of rectangle ABCD
Since Area of ΔCDE = 30% of Area of rectangle ABCD,
Area of ΔABE = 50%-30%=20%
20%=80 cm² (Given that Area of ΔABE=80 cm²)
100% = 80 cm² x5 = 400 cm²
Area of rectangle ABCD = 400 cm²

Note: Pls wait for other members to upload the diagram of the question as it is not easy to work without the diagram.

abc_parent:

Q13) It takes Mrs Lim 7 hours to sew a dress by herself. If Mrs Tan helps her, they will take 3 hours to sew the dress. How long will Mrs Tan take to sew the dress by herself?

Mrs Lim
7 hours -> 1 dress
3 hours -> 1/7x3 = 3/7 dress

Mrs Tan
3 hours -> 1-3/7 = 4/7 dress
1 dress -> 3x7/4 = 21/4 = 5.25 hours

For Mrs Tan to sew 1 dress by herself, she will need 5.25 hours

abc_parent:

Q16) At 8am, Richard left Town A in his car and travelled towards Town B at 90km/h. At the same time, Kenny left Town A in his car and travelled in the opposite direction towards town C. When Kenny reached Town C at 10.30am, Richard was 15 km away from Town B.
a) What was the distance from Town A to Town B?
b) If the distance between Town B and C was 440km, what was Kenny's average speed?

From 8 a.m. to 10.30 a.m., time lapsed = 2½ hours
(90 km/hx2½h)+15km = 240 km
(a) Distance from Town A to Town B = 240 km

Distance from A to C =(440-240)km = 200 km
since it was given that distance between Town B and Town C = 440 km
Average speed of Kenny = 200 km÷2½h = 80 km/h

abc_parent:

Q18) Aisha, Bala, Cindy and Dannyt went to buy a gift for Miss Emily. They shared the cost equally among themselves. However, Danny forgot to bring his money. So his friends paid for the gift first.
Cindy paid 3/5 of the amount Aisha and Bala paid.
Bala paid $10 more than Aisha.
The next day, Danny returned $24 to Cindy and some money to Aisha and Bala.
How much did Danny return to
a) Aisha?
b) Bala?

C : A+B
3 : 5
Total price for the gift = (3+5)u = 8u as Danny had forgotten to bring his money.

A : B : C : D
2 : 2 : 2 : 2

A+B= (2+2)u = 4u

Danny returned $24 to Cindy
(3-2)u= u = $24

Bala paid $10 more than Aisha
(5-4)u= u
Amount of money that Aisha paid for Danny = $(24-10)÷2=$7
(a) Amount of money returned by Danny to Aisha = $7

$(10+7)=$17
(b) Amount of money returned by Danny to Bala = $17

[Vanilla Cake]

Hifive:

The ratio of $5-notes to 20-cent coins in Mr Tan's counter was 19:5. Mr Tan exchanged 15 of his $5-notes for some 20-cent coins. The ratio of the $5-notes to 20-cent coins then became 1:5. What was the total value of $5-notes and 20-cent coins at first?

Hi Hifive,
This method is from http://www.onsponge.com/forum/35-thinkingmathonsponge.html, not sure whether it is suitable or not.Pls wait for other members to post model solution.

Exchanged 15 of his $5-notes for some 20-cent coins, number of 20-cent coins = (15x5) divided by 0.20 = 375 each of 20-cent coins.

$5 : 20¢
19u : 5u
-15 : 375
1p : 5p

$5 : 20¢
95u : 5u
-75 : 375
5p : 5p

95u-75=5u+375
90u=450
u = 5

At first
Number of $5 notes = 19u = 19x5 = 95
Number of 20-cent coins = 5u = 5x5 = 25

At first
Value of 95 each of $5 notes = 95x$5 = $475
Value of 20-cent coins = 25x$0.20 = $5

Total value of $5-notes and 20-cent coins at first = $(475+5) = $480

[Almighty]

ksi:

Almighty, you know how to upload photo?
maybe you can use the camera to snap a shot and then upload the jpg file onto hosting site, this can do too......then using the tags to post it here.

SSS...I'll try to do this..Thanku so much Ksi..

[tianzhu]

Hi Almighty


You may follow the following steps (using Flickr in this example)

1) Do a print screen of the question you want to upload.

2) Edit using paint. Cut out the portion of the question you want to upload.

3) Save file in pictures (XP or Vista)

4) Go to Flickr (Free sign up as member). Upload file. Select biggest size. Right click copy URL of image. You may also use other storage media.

5) Coming back to KSP, click insert image,Img and you are on your way to insert image.

Best wishes

[Almighty]

Thankyou very much for the elaborate explanation.Tianzhu

[Almighty]

Please try to solve my qt:

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?Refer drawing :Ans 30.
According to Muffins, (sorry for wrongly writing KSi earlier)9x2 + 6X2 = 30. Y cant i take 9X4 = 36. Pl.clarify
http://www.postimage.org/image.php?v=gx9BwdS

[Almighty]

Hi , Second problem- please help:

http://www.postimage.org/image.php?v=TsIm00
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.

[Almighty]

3rd question please Help:

http://www.postimage.org/image.php?v=PqwW4ji