The economy of Nälkä is based on exactly two goods: cookies (good 1) and smiles (good 2). To make one smile, you need (1/5) cookie and (3/4) smile. To make one cookie, you need (1/5) cookie and (1/2)...

The economy of Nälkä is based on exactly two goods: cookies (good 1) and smiles (good 2). To make one smile, you need (1/5) cookie and (3/4) smile. To make one cookie, you need (1/5) cookie and (1/2) smile. There is a demand for 10 cookies and 20 smiles. How many smiles must be produced to meet the demand?