During particle size analysis of soil texture, the corrected hydrometer reading for a 50 g soil...

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During particle size analysis of soil texture, the corrected hydrometer reading for a 50 g soil sample was 20 g/L at 40 seconds and 15 g/L at two hours. Calculate the percentages of sand, silt and clay? During particle size analysis of soil texture, the corrected hydrometer reading for a 50 g soil sample was 20 g/L at 40 seconds and 15 g/L at two hours. Calculate the percentages of sand, silt and clay?