An agriculture field is in the form of a rectangle of length 20 m, and width 14 m. A 10 m deep well of diameter 7 m is dug in a comer of the field and the earth taken out of the well is spread evenly over the remaining part of the field. Find the rise in the level of the field.

Since shape of the well is just like the shape of cylinder, so we consider well as cylinder.
Let r m be the radius and h m be the height of the well, then 

Now,
Volume of earth dug out = 

                          
Also, we have, 
Length of the rectangular field = 20 m
Breadth of the field = 14 m
Therefore, are of the field = (20 x 14) m²
                                      = 280 m²
And
   Area of the remaining part of the field
               = Area of field - Area of the base
                 
                     
Since,
Volume of the raised field
         = Volume of the earth dug out

Hence, rise in the level of the field = 1.6 m (apporx.)