Question 257919
Let x pounds of peanuts and y pounds of cashews be mixed.
Then,   x+y = 100   ...(1)
Given, the wholesaler charges $2.80 per pound for peanuts and %5.30 per pound for cashews. The mix is to sell for $3.30 per pound.
So,        2.80x+5.30y = 3.30(x+y)
           2.80x+5.30y = 3.30*100
           2.80x+5.30y = 330 ...(2)
(1)*2.80=> 2.80x+2.80y = 280 ...(3)
(2)-(3) =>      2.50y = 50
                    y = 50/2.50
                    y = 20
(1)=>     x+20 = 100
          x = 100-20 = 80
So 80 pounds of peanuts and 20 pounds of cashews be mixed.