mr.cutler makes clay bricks and clay tiles to sell at marker fairs . it takes him 10 minutes to make a brick and 20 minutes to make a tile . each brick uses 3 pounds of clay and each tile uses 2 pound of clay . he has 160 minutes available for making the bricks and tiles and has 20 pounds of clay on hand . if he makes a profit of $2 on each brick and $3 on each tile , how many bricks and tiles should he make to maximize his profit?