Question 1124743
{{{30x+60y=57*200}}}
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{{{y=200-x}}}
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{{{30x+60(200-x)=57*200}}}

{{{3x+6(200-x)=57*20}}}

{{{x+2(200-x)=19*20}}}

{{{x+400-2x=380}}}

{{{-x=-20}}}

{{{highlight(x=20)}}}-------------kilograms of the 30% fat
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{{{highlight(180)}}}--------------kilograms of the 60% fat