Question 361700
{{{3.60x + 2.40(10-x) = 10*3.30}}},
{{{3.60x + 24 - 2.40x = 33}}},
{{{1.20x = 9}}},
{{{x = 7.5}}}.  They have to combine 7.5 lbs of $3.60/lb nuts, and 2.5 lbs of $2.40/lb nuts.