
By: Tping (offline) Friday, March 29 2013 @ 08:21 AM CDT (Read 681 times)



Tping 
Hi, please help..
Xishi and Raju were each given some money.
If Xishi spent $25 each week and Raju spent $75 each week,
Xishi would still have $1350 of her money left when Raju had spent all his money.
If Xishi spent $75 each week and Raju spent $25 each week,
Xishi would still have $150 of her money left when Raju had spent all his money.
How much money did Xishi receive?
Thank you.

Junior
Registered: 01/26/12 Posts: 25





By: echeewh (offline) Friday, March 29 2013 @ 05:56 PM CDT



echeewh 
Hi Tping,
Following is my worked solution.
<1st IF>
X : R
25 : 75
1 : 3
X < 1350 >
R 
<2nd IF>
X : R
75 : 25
3 : 1
X < 150 >
R 
***** < 1200 >
From the above 2 models and using <Gap & Difference> method, we have ...
8u > 1200
1u > 1200 รท 8 = 150
X = 1u + 1350 > 150 + 1350 = $1500
==========
Trust the above helps.
Do let me know again if this is different from your Answerkey or if theres further clarification.
Cheers,
Edward

Active Member
Registered: 04/21/11 Posts: 623



