A man invest $1800 at 9/2 % and $2000 at 5%. How much must he invest at 6% so that the average income on the three investments will be 5% ?(adsbygoogle = window.adsbygoogle || []).push({});

=============================================

I set an equation and solved, then found he must invest -$1322 at 6% :surprised

What does the negative sign mean ? Probably I have made a mistake. If so please let me know.

Thanks

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Investment problem

**Physics Forums | Science Articles, Homework Help, Discussion**