Asked by keisha

An investment of $180,000 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 the third 9%. Total interest from the investments was $8520. The interest from the first investment was 6 times the interest from the second. Find the amounts of the three parts of the investment.
Answered by Steve
If the amounts invested are x,y,z then they have told us that

x+y+z = 180000
.08x + .06y + .09z = 8520
.08x = 6 * .06y

I suspect a typo, since even if the whole amount were invested at 6%, the interest would be 10,800. In other words, there's no way to solve these equations and get positive amounts.
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