Question 1204645
<pre>
MATERIAL         QUANTITY        QUANTITY Post-sale
Rice               r               r-x
Flour              f               f-x
Total              142
</pre>

{{{system(r-x=2(f-x),x=r-x-20,r+f=142)}}}


************ REDONE***********


Questions are for finding r, and x.  f can be substituted-for.


{{{system(r-x=2f-2x,x=r-x-20,r+f=142)}}}


{{{system(r+x=2f,2x-r=-20,f=142-r)}}}, now sub. for f.


{{{system(r+x=2*142-2r,2x-r=-20)}}}


{{{system(3r+x=284,-r+2x=-20)}}}

Use 3*E2.


{{{system(3r+x=284,-3r+6x=-60)}}}

ADD.

{{{7x=224}}}

{{{highlight(x=32)}}}---------------amount sold, of each


{{{r-2x=20}}}
{{{r=2x+20}}}
{{{r=64+20}}}
{{{highlight(r=84)}}}--------initial amount of rice, before selling any