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Pri 5 External Changed (AKA Total Change)

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#4510

Pri 5 External Changed (AKA Total Change) 1 Year, 5 Months ago	Karma: 0
Siti had some money. She gave some money to Kelly and Lindy and saved the rest.The ratio of her savings to the amount she gave away was 5:8. The ratio of Kelly's money to Lindy's money was 5:3 at first.After Kelly's money increased by $128 and Lindy's money decreased by $128,the ratio of Kelly's money to Lindy's money became 3:1.How much money did Siti save? Any solution to this question?Tks.

yap

Last Edit: 2010/08/25 07:43 By Chris.

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#4512

P5 Maths 1 Year, 5 Months ago

Karma: 43

yap wrote:
Siti had some money. She gave some money to Kelly and Lindy and saved the rest.The ratio of her savings to the amount she gave away was 5:8. The ratio of Kelly's money to Lindy's money was 5:3 at first.After Kelly's money increased by $128 and Lindy's money decreased by $128,the ratio of Kelly's money to Lindy's money became 3:1.How much money did Siti save?
Any solution to this question?Tks.
Hi Yap,
The answer is $640
Why don't you give a try first?

Suggested solution
Siti
Saved : Gave away
5 : 8

At first
Kelly : Lindy
5 : 3

Change
Kelly's money increased by $128 and Lindy's money decreased by $128

After
Kelly : Lindy
3 : 1

K : L
5u : 3u
+128 : -128
3p : p

K : L
5u : 9u
+128 : -384
3p : 3p

5u+128=9u-384
4u=512
u=128

5u =5x128=640
Siti saved $640.

Perseverance

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#4579