Question 984982
x=pounds of cashews
4x=revenue of cashew.
profit will be $105 (70 pounds of peanuts @$1.50 lb)
4x+105=(70+x)(3.50)
4x+105=245+3.50x
0.5x=140
x=280 pounds of cashews.
check
350 pounds @3.50 per pound is $1225.
280 pounds of cashews are $1120
70  pounds of peanuts are $105
That adds to $1225.
This makes sense, because the average price is going to be very close to what cashews sell for, so one would expect more cashews in the mixture.