Homework Help: college alg help!

Posted by alexandra on Thursday, November 18, 2010 at 1:41pm.

cannot figure a way to do this problem:

An investment of $98,000 was made by a business club. The investment was split into three parts and lasted for one year. The first part of the investment earned 8% interest, the second 6%, and third 9%. The total interest from the investments was $7560. The interest from the first investment was 3 times the interest from the second. Find the amounts of the three parts of the investment.

so I let the three investment amounts be E, S, and N

E+S+N=98000

7500=E*.08+S*.06+N*.09
E*.08=3*S*.06

I don't know how to figure out answer past that

college alg help! - drwls, Thursday, November 18, 2010 at 2:37pm
Since E = 2.25 S (from the last equation), you can eliminate E from the other two equations. Then solve two equations in two unknows (S and N).

Follow the advice that BobPursley gave to Samantha.

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