Question 1167786
<pre>
RADIO                  r

MAGAZINE               m

TV                     r+m

TOTAL                  60000
</pre>
{{{m+(r+m)=5r}}}


--


{{{system(2r+2m=60000,r+2m=5r)}}}


"gaussian elimination method?"

<pre>
2   2   60000
-4  2    0

2   2   60000
4  -2     0

1   1   30000
2  -1    0
ADD these.....

3   0   30000

1   0    10000
</pre>

This means  r=10000