Question 592081
<pre>
RATE%           AMT.             INTEREST
5                x               0.05x
7               5000-x           0.07(5000-x)
                 5000               325
</pre>
The question asked, "how much invested at 5%?"
The variable is assigned to that amount for that reason.


{{{0.05x+0.07(5000-x)=325}}}

----

{{{0.05x+0.07*5000-0.07x=325}}}

{{{(0.05-0.07)x=325-0.07*5000}}}

{{{x=(325-0.07*5000)/(0.05-0.07)}}}

{{{x=(350-325)/(0.07-0.05)}}}

{{{x=25/0.02}}}

{{{highlight(highlight(x=1250))}}}