Q&A - PSLE Math

[stary]

what is the number of times for each ranking?


Kiasu Newbie -> 0-10
Yellow -> 11-???
…
…
Black -> ???-1000

[P5G]

Please help.


http://www.orlesson.org/orp/10Ma/2010-P6-Math-SA2-Nanyang.pdf

17. There were some blue marbles and white marbles in a bag. If 70 blue marbles were to be removed from the bag, the ratio of the number of blue marbles to the number of white marbles would be 3 : 4. If 112 white marbles were to be removed from the bag instead, the ratio of the number of blue marbles to the number of white marbles would be 8 : 7. When 48 more blue marbles were to be added into the bag, what percentage of all the marbles would be blue marbles?

TIA.

[MathIzzzFun]

P5G:

Please help.


http://www.orlesson.org/orp/10Ma/2010-P6-Math-SA2-Nanyang.pdf

17. There were some blue marbles and white marbles in a bag. If 70 blue marbles were to be removed from the bag, the ratio of the number of blue marbles to the number of white marbles would be 3 : 4. If 112 white marbles were to be removed from the bag instead, the ratio of the number of blue marbles to the number of white marbles would be 8 : 7. When 48 more blue marbles were to be added into the bag, what percentage of all the marbles would be blue marbles?

TIA.

Hi P5G,

hope this helps

http://www.flickr.com/photos/62167097@N02/5884185905/in/photostream

cheers.

[zsqchx]

Hi MathIzzzFun ,


Thank you for your help!

[MathIzzzFun]

zsqchx:

Hi MathIzzzFun ,


Thank you for your help!

u r welcome

cheers.

[raghupavithra]

wei quan has the same number of $10 notes and $50 notes what fraction of his money of his half of his $10notes?



how solve this sum pls help

[raghupavithra]

the cost to print a banner depends on the size of the banner. it also includes a fixed processing fee. A banner 5m long and 3m wide costs $75 to print.Another banner 4m long and 2m wide costs $47 to print


How much is the fixed processing fee?

how to solve the problem

[bobsg01]

Need some engligtenment on this answer.


In Total number of parts the figure has is 2 + 9 = 11 units

Why does it used 9 instead of 8 with minus 1 for Z? Confusing because they used 2 for X (which is minus 1 instead of 3). :?

Thanks for your kind assistant.

http://i53.tinypic.com/cltf5.jpg\">

http://i52.tinypic.com/2ivffh0.jpg\">

[WS1234567]

raghupavithra:

the cost to print a banner depends on the size of the banner. it also includes a fixed processing fee. A banner 5m long and 3m wide costs $75 to print.Another banner 4m long and 2m wide costs $47 to print


How much is the fixed processing fee?

how to solve the problem

Area of 1st banner: 5 x 3 = 15
Area of 2nd banner: 4 x 2 = 8
Difference in cost: $75 - $47 = $28
Difference in areas: 15 - 8 = 7
So, 7 units =$28
1 unit = $4
8 units = $4 x 8 = $32
Fix processing cost = $47 - $32 = $15

[MathIzzzFun]

bobsg01:

Need some engligtenment on this answer.


In Total number of parts the figure has is 2 + 9 = 11 units

Why does it used 9 instead of 8 with minus 1 for Z? Confusing because they used 2 for X (which is minus 1 instead of 3). :?

Thanks for your kind assistant.

http://i53.tinypic.com/cltf5.jpg\">

http://i52.tinypic.com/2ivffh0.jpg\">

Hi bobsg01,

The ratio of the areas, A : B : C = 3 units : 4 units: 9 units, so 9 units is the total area of Z.

cheers.