Answer to Question #326621 in Linear Algebra for Fionna

Question

A construction company manufactures bags of concrete mix from beach sand and river sand. Each cubic of gravel. Each cubic meter of river sand costs P100 and contains 3 units of fine sand, 6 units of coarse sand, and 2 units of gravel. Each bag of concrete must contain at least 12 units of fine sand, 12 units of coarse sand, and 10 units of gravel. Find the best combination of beach and river sand which will meet the minimum requirements of fine sand, coarse sand, and gravel at the least cost.