The production of a glass needs three main raw materials: sand, limestone, and soda ash. A glass manufacturer wants the total production cost for glass to be $2.3 per gram when the cost of sand. limestone, and soda ash are respectively $3, $0.5, and $2.10 per gram. The amount of sand needed is 3 times the amount of limestone. How much of each material is required in one gram of glass?

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