a well of inner diameter 14 cm is dug to depth of 12 m earth taken out of it has been evenly spread all around it to a width of 7 cm to from an embankment.find the height of the embankment so formed?
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Diameter of well = 14 m
∴ Radius (r) of well = 
Depth of well = 12 m
∴ Volume of earth removed to dug a well 

Width of the earth spread to form an embankment = 7 m
∴ Outer radius of the well (R) = 7 m + 7 m = 14 m
Volume of the earth used to form embankment 

Now, volume of earth used to form embankment = Volume of earth removed to form well
462 h = 1848

⇒ h = 4
∴ Height of the embankment = 4 m
∴ Radius (r) of well = 
Depth of well = 12 m
∴ Volume of earth removed to dug a well 

Width of the earth spread to form an embankment = 7 m
∴ Outer radius of the well (R) = 7 m + 7 m = 14 m
Volume of the earth used to form embankment 

Now, volume of earth used to form embankment = Volume of earth removed to form well
462 h = 1848

⇒ h = 4
∴ Height of the embankment = 4 m
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