How many tons of cement, sand and stone are needed to make 96 tons of concrete with cement, sand and stone in the ratio of 2:3:5?
96 × 22 + 3 + 5 = 19.2 (tons); 96 × 32 + 3 + 5 = 28.8 (tons); 96-19.2-28.8 = 48 (tons); a: 19.2 tons of cement, 28.2 tons of sand and 48 tons of stone are required
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