Question 1092944
v, volume to remove and replace, in liters


{{{(10*4000-10v+17v)/4000=12}}}

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{{{10*4000+7v=12*4000}}}

{{{7v=12*4000-10*4000}}}

{{{7v=2*4000=8000}}}

{{{v=8000/7}}}

{{{highlight(v=1143)}}}


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check
{{{0.10*4000-0.10*1143+0.17*1143)/4000}}}
{{{(400-0.07*1143)/4000}}}
{{{12.00025}}},{{{good}}}{{{approximation}}}