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Marsha Mellow is very exible. She consumes x and y. She says `Give me x or give me y; I don't care. I can't tell the difference between them.' She is currently endowed with 4 units of x and 17 units of y. The price of x is 2 times the price of y. Marsha can trade x and y at the going prices, but has no other source of income. How many units of y will Marsha consume?