Granola costs $2.50 per pound. Assorted nuts cost $5 per pound. How many pounds of granola and nuts are needed to make 7 pounds of trail mix that costs $4 per pound?

Answer 1

2.50·x + 5(7 - x) = 7·4; 2.5x - 5x = 28 - 35; 2.5x = 7; x = 2.8 lb

2.8 lb granola and (7 - 2.8) = 4.2 lb nuts