how many cubic metres of earth must be dug out to make a well 28m deep and 2.8 m in diameter?also find the cost of plastering its inner surface at rail.4.50 per square.metre.
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how many cubic metres of earth must be dug out to make a well 28m deep and 2.8 m in diameter?also find the cost of plastering its inner surface at rail.4.50 per square.metre.
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