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Sunday, November 19 2017 @ 11:35 AM CST
 Forum Index >  Test Paper Related >  Primary 6 Matters
 Nanyang 2010 SA2 Question 13
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By: jlopez (offline)  Sunday, August 21 2011 @ 02:45 AM CDT (Read 1300 times)  
jlopez

Hi

Can anyone be able to explain this problem, how to solve by using model?
I can't understand the ans-key's answer. It's very confusing.


Quincy and Mandy saved $5748.40 altogether. 0.4 of Quiny's savings was $431.50 more than 0.2 of Mandy's savings.
How much more money than Quincy dis Mandy save?



Thank you. Frown Rolling Eyes Rolling Eyes Rolling Eyes

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By: pkrdd (offline)  Sunday, August 21 2011 @ 03:18 AM CDT  
pkrdd

Hi,

I will explain in words since I cannot draw model here

total savings of quency & Mandy = $5748.40

if Quency savings are divided into 10 units and Mandy's savings are divided into 10 parts then

10 u + 10 p = 5748.40

u + p = 574.84

0.4 of quency savings is nothing but 4u of quency (4/10)
0.2 of Mandy savings is nothing but 2p of Mandy (2/10)

4u - 2p = 431.50
2u - p = 215.75
u + p = 574.84

3u = 790.59 (215.75 + 574.84)
u = 263.53 (790.59/3)
p = 311.31 (574.80 - 263.53)

Quency savings = $2635.30
Mandy Savings = $3113.10

Ans: Mandy saved $477.80 more than Quency (3113.10 - 2635.30)

Hope this helps

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By: jlopez (offline)  Sunday, August 21 2011 @ 04:00 AM CDT  
jlopez

Thanks pkrdd.

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