Question 958371
The cost of the mixture and the cost of the separate ingredients to be equal, this cost is {{{10*pounds*(2*dollars/pound)=20*dollars}}}.


Let p be pounds of peanuts and then 10-p be pounds of raisins.
{{{2.5p+1.75(10-p)=20}}}
{{{10p+7(10-p)=80}}}, multiplied members by 4,
{{{10p+70-7p=80}}}
{{{3p+70=80}}}
{{{3p=10}}}
{{{highlight(p=10/3)}}}, and from that, {{{highlight((10-p)=6&2/3)}}}