# Daily Maximum Production

Algebra Level 2

A factory uses zinc and copper to produce 2 products - Pennies and Doorknobs. A unit of Pennies is produced from $$3$$ kg of zinc and $$1$$ kg of copper, while a unit of Doorknobs is produced from $$2$$ kg of zinc and $$2$$ kg of copper.

The maximum daily supply of zinc is $$160$$ kg and the maximum daily supply of copper is $$120$$ kg. Let $$x$$ be the number of units of Pennies produced each day and $$y$$ the number of units of Doorknobs produced each day. What is the maximum value of $$x+y?$$

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