A kind of concrete, the ratio of cement, sand and stone is 2:3:5, there are 7.5 tons of sand, if all of them are used, how many tons of such concrete can be mixed?

The apparent density of ordinary concrete per cubic meter is 2400KG, so 0.72 tons of sand is used per cubic meter of concrete. 7.5 tons of sand can be used to make 10.4 cubic meters of concrete, and the result is 10.4 × 2.4 = 24.96 tons

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