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Thursday, September 21 2017 @ 06:06 PM CDT
 Forum Index >  Test Paper Related >  Primary 6 Matters
 RGS –SA1-2010, Paper 2 Qn4
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By: thayal (offline)  Saturday, April 28 2012 @ 10:18 AM CDT (Read 1073 times)  
thayal

HI All
psl help to answere the following qn.

Basket A and B have equal number of marbles.
The number of blue marbles in basket A is 3/5 of the number of blue marbles in basket B.
The number of red marbles in basket B is 3/7 of the number of red marbles in basket A.
What is the ratio of the number of blue marbles to the number of red marbles in basket B?

thanks
thyal

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By: MathIzzzFun (offline)  Saturday, April 28 2012 @ 11:57 PM CDT  
MathIzzzFun

Quote by: thayal

HI All
psl help to answere the following qn.

Basket A and B have equal number of marbles.
The number of blue marbles in basket A is 3/5 of the number of blue marbles in basket B.
The number of red marbles in basket B is 3/7 of the number of red marbles in basket A.
What is the ratio of the number of blue marbles to the number of red marbles in basket B?

thanks
thyal



Hi
difference in blue marbles = difference in red marbles

Blue A : Blue B --> 3:5 (difference of 2), Red A : Red B --> 7:3 (difference of 4)
So,
Blue A : Blue B --> 6u : 10u
Red A : Red B --> 7u : 3u
So, Blue B: Red B = 10:3

cheers.

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By: thayal (offline)  Sunday, April 29 2012 @ 04:12 AM CDT  
thayal

HI
Thanks for ur reply but still could you share some details on how you say that both the difference in two marbles are the same
thanks

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By: MathIzzzFun (offline)  Sunday, April 29 2012 @ 07:23 AM CDT  
MathIzzzFun

Quote by: thayal

HI
Thanks for ur reply but still could you share some details on how you say that both the difference in two marbles are the same
thanks



Hi

you may want to draw a simple model
- draw 2 equal blocks for Basket A and Basket B and each with Blue and Red
- Blue region in A is longer than Blue region in B

and you will see why the difference is the same.

cheers.

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By: thayal (offline)  Wednesday, May 02 2012 @ 06:51 AM CDT  
thayal

HI Mathizzfun

Perfect explanation ... thanks

Thayal

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