GEOMETRY QUESTION OF THE DAY

Three solid cubes of lead, each with edges 10
centimeters long, are melted together in a level,
rectangular -shaped pan. The base of the pan has inside
dimensions of 20 centimeters by 30 centimeters, and
the pan is 15 centimeters deep. If the volume of the
solid lead is approximately the same as the volume of
the molted lead, approximately how many centimeters
deep is the melted lead in the pan?
(A) 2.5
(B) 3
(C) 5
(D) 7.5
(E) 9