Intermediate/AdvancedA Jewler Purchased 5 oz of a gold alloy and 20 oz. of a silver alloy for a total cost of $540. The next day, at the same prices per ounce, the jewler purchased 4 oz. of the gold alloy and 25 oz. of the silver alloy for a total cost of $450. Find the cost per ounce of the gold and silver alloys.
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