Question 1196974
<pre>
THREAD              FRCT.SILK      KILOGRAMS

PURE SILK             1.0            Q

80% SILK              0.8            60-Q

FINISHED CLOTH        0.95           60
</pre>
{{{highlight_green(1*Q+0.8(60-Q)=0.95*60)}}}
This should be perfectly understandable and needs no further explanation.