Question

how many pounds of peanuts that sell for $2 a pound must be mixed with six pounds of cashew nuts that sell for$4 a pound to get a mixture that can sell for $2.50 a pound?

Answer 1

x pounds of peanuts + 6 pounds cash = (x+6) pounds mix

2 x + 4 * 6 = 2.5 (x+6)

2 x + 24 = 2.5 x + 15

.5 x = 9

x = 18