63 small identical cubes are used to form a large cube. How many more cubes are needed to add one top layer of small cube all over the surface of the large cube ?
Answers:  A) 64  B) 128  C) 152  D) 216  E) 153
63 small cube will make a large cube with 4 cubes in each line i.e.   Adding one layer will require one cube at each end and hence new cube will have 6 cubes in each line.   Total number of small cubes in new cube = 6^3 = 216   153xtra cube required = 216 - 63= 
<gadget id="calculator">216 - 63</gadget>
<output>153</output>
153   Hence, 153 is the answer.
<result>E</result>
63 small identical cubes are used to form a large cube. How many more cubes are needed to add one top layer of small cube all over the surface of the large cube ?