<PRE><B>Question 564881</B>
Equal amounts are invested at 6%, 7%, and 9% annual interest.
 If the three investments yield a total of $814 annual interest, find the total investment.
:
Let x = amt invested at each interest
;
.06x + .07x + .09x = 814
.22x = 814
x = {{{814/.22}}}
x = $3700 invested at each
therefore
3(3700) = $11,100 is the total</PRE>