A baker needs 15 lb of cream cheese that contains 20% fat to fill a big order. But his supplier delivers one cream cheese that contains 10% fat, and another that contains 35% fat. How many pounds of each should the baker combine to fill the order?
+37158 fat ingredients = final fat amount
.10x + .35(15-x) = .20 (15)
solve for 'x' the amount of 10% to use then 35% amount = 15-x
