<h5>Concrete consists of cement, sand and screenings in the ratio of 1 : 5 : 4, What is the percentage of the sand mixed?</h5>

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Concrete consists of cement, sand and screenings in the ratio of 1 : 5 : 4, What is the percentage of the sand mixed?

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Concrete consists of cement, sand and screenings in the ratio of 1 : 5 : 4, What is the percentage of the sand mixed?