If I have cashews for 7.30 a pound an Brazil nuts for 5.40 a pound how much of each is used to make a 28 pound mixture for 6.28 a pound

Answer 1

c + b = 28
so c= 28 - b

7.30 c + 5.40 b = 6.28 * 28 = 175.84
7.30 (28 - b) + 5.40 b = 175.84
204.4 - 7.30 b + 5.40 b = 175.84
204.4 -175.84 = (7.30 -5.40) b
b = 28.6 / 1.9 = 15 pounds of Brazil nuts
etc