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August 20, 2014

August 20, 2014

Posted by **Sarah Mae B. Oquindo** on Friday, February 12, 2010 at 10:07am.

- math -
**drwls**, Friday, February 12, 2010 at 10:39amSuppose x is invested at 10%, y is invested at 12% and z is invested at 16%. Here is what you know:

x + y + z = 25,000

0.10 x + 0.12 y + 0.16 z = 3200

0.16 z = 0.10 x + 0.12 y

You can immediatley write

2*(0.16 z) = 0.32z = 3200

So z = $10,000

Therefere x + y = $15,000.

You also know that

0.10x + 0.12 y = 1600

Now finish it. You have two equations in two unknowns left.

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