Question 965246
{{{70X+25Y=0.6(270)}}}
{{{70X+25Y=16200}}}
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{{{X+Y=270}}}
Multiply the second equation by {{{25}}} and subtract from the first.
{{{70X+25Y-25X-25Y=16200-6750}}}
{{{45Y=9450}}}
{{{Y=210}}}
Then,
{{{X+210=270}}}
{{{X=60}}}
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60 l of 70% and 210 l of 25%