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here is it.
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hope this helps. (credits to the owner)
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area of rectangle=length×breadth
=154×121
=18634m^2
area of well=14×11
=154m^2
area of mud=1863-154
=18480m^2
hence,volume of mud=area×thickness
18480×25cm
18480×1/4m
=4620m^3
hence,depth of well=volume of mud/volume of well
=4620/154
=30m
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