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Saturday, February 25 2017 @ 02:26 PM CST
 Forum Index >  Test Paper Related >  Primary 5 Matters
 P5 model fraction
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By: petermarksmith (offline)  Sunday, February 19 2012 @ 03:00 AM CST (Read 1090 times)  
petermarksmith

2/3 of C savings is the same as 1/4 of M's savings. After both spend $250, C has $700 less than M.

I can do this in algebra but not with a model. Would someone mind showing me how it's done with the model?

2/3C = 1/4M
Therefore 8/3C = M


C-250=M-250+700
C=8/3C+700
....
C = $420.

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By: KJPang (offline)  Sunday, February 19 2012 @ 09:44 AM CST  
KJPang

C’s savings is 3 units. Since 1 unit of M equals 2 units of C, M’s savings will be 4 x 2 = 8 units.

(For model, please see attachment)

Since both spent the same amount of money, the difference in the money they have has not changed. Since their difference is 5 units,
5 units =700
1 unit = 700 / 5 = 140
C = 3 units = 3 x 140 = 420

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