Answer:
Volume of earth taken out after digging the well of height 21 m and diameter 6 m. \[=\frac{22}{7}\times \frac{6}{2}\times \frac{6}{2}\times 21\] Let h be the height of the platform formed by the earth dug out. \[\therefore \] Volume of platform = Volume of earth dug out \[27\times 11\times h=594\] \[h=\frac{594}{27\times 11}\] \[=2.02\,\,m\approx 2\,\,m\] \[\therefore \] Height of the platform \[=2\text{ }m\]
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