Q&A - PSLE Math

[WWong]

WWong:

Hi,


I would like to seek some help, with thanks, on the below question.

1/3 of circle A is shaded and 3/7 of circle B is shaded. The ratio of the total area of circles A & B to the area of circle C is 5 : 8. What fraction of circle C is not shaded ?

http://i54.tinypic.com/flgewn.jpg\">

Thank you!

Sorry. Still couldn't figure that out. Appreciate very much on the solution. Thank you very much.

[MathIzzzFun]

WWong:

Hi,


I would like to seek some help, with thanks, on the below question.

1/3 of circle A is shaded and 3/7 of circle B is shaded. The ratio of the total area of circles A & B to the area of circle C is 5 : 8. What fraction of circle C is not shaded ?

http://i54.tinypic.com/flgewn.jpg\">

Thank you!

Hi

There is some information missing... as it is, there will be more than one possible answer...

Let A = 15 units, B=35 parts
A, shaded = 5 units
B, shaded = 15 parts

C = (15units + 35 parts) / 5 x 8 = 24 units + 56 parts
C, unshaded = (24 - 5) units + (56 - 15 parts) = 19 units + 41 parts

Fraction of C that is unshaded
= (19 units + 41 parts )/(24 units + 56 parts)

So, depending on the relationship between 1 unit and 1 part, there could be more than one possible answer. For example,

if 1 unit = 1 part, we have
Fraction of C that is unshaded
= (19 units + 41 units) / (24 units + 56 units)
= 60 /80 = 3/4

If 1 unit = 2 parts, we have
Fraction of C that is unshaded
= (38 parts + 41 parts) / (48 parts + 56 parts)
= 79/104

so on and so forth....

cheers.

[chl72]

tianzhu:

chl72:

Hi TianZhu,
Paisay to trouble you, what's the answer for this Q ah?
TIA

Hi

The answer is 80.

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=68&t=25129&start=80

Best wishes

Hi Tianzhu,

:thankyou:

Cheers!

[tianzhu]

WWong:

Sorry. Still couldn't figure that out. Appreciate very much on the solution. Thank you very much.

Hi

Please refer to earlier post for solution.

I’ve provided the solution instead of links.

Best wishes

[tianzhu]

chl72:

Hi Tianzhu,

:thankyou:

Cheers!

Hi

You’re welcome.

Best wishes

[WWong]

Hi tianzhu,


Thank you very much for your kind guidance.

WWong

[Andrew Lee]

WWong:

Hi tianzhu,


Thank you very much for your kind guidance.

WWong

Hello, can help me solve this headpain sch question ?
http://i53.tinypic.com/2s6sjmp.jpg\">

[Andrew Lee]

WWong:

Hi tianzhu,


Thank you very much for your kind guidance.

WWong

Morning,
Janelle went to a florist to buy some flowers. She spent 1/6 of her money on q bouquet of roses and $154 on a bouquet of lilies. She spent 1/9 of her remaining amount on a bouquet of carnation flowers. If the amount of money left was $240 more than 1/4 of the amount she had at first, how much had she left? :?

[tianzhu]

WWong:

Hi tianzhu,


Thank you very much for your kind guidance.

WWong

Hi

You’re welcome.

Best wishes

[tianzhu]

Andrew Lee:

Hello, can help me solve this headpain sch question ?

http://i53.tinypic.com/2s6sjmp.jpg\">

Hi

Just to confirm, is it 'Total area of X and Y is equal to 3/4 of Z\" or \"Total area of X and Z is equal to 3/4 of Y\"

Best wishes