Question 890734
u of the cheap nuts, v of the expensive nuts


{{{(6u+18v)/24=16.5}}} and {{{u+v=24}}}


Use {{{v=24-u}}}.


{{{6u+18v=24(16.5)}}}
Divide b.s. by 6;
{{{u+3v=4(16.5)}}}
{{{u+3(24-u)=4(16.5)}}}
{{{u+72-3u=4(16.5)}}}
{{{-2u=-72+4(16.5)}}}
{{{u=36-2(16.5)}}}
{{{u=36-33}}}
{{{highlight(u=3)}}}