Question 1090653
4% oil is {{{1/3}}} of the way from 2% oil to 8% oil.  Does this help you?

-

x, how much of the 2% oil
10-x, how much of the 8% oil


{{{2x+8(10-x)=4*10}}}

{{{x+4(10-x)=20}}}

{{{x+40-4x=20}}}

{{{-3x=-20}}}

{{{x=20/3}}}


{{{x=6&2/3}}}, Liters of the 2% oil mixture
{{{3&1/3}}}, Liters of the 8% oil mixture