30.) 78 Identical Cubes Each With 2 Cm Edge Are Joined Together To Form A Cuboid. If The Perimeter Of The Base Of The Cuboid Is 64 Cm, Then The Number Of Cubes Along The Height Of The Cuboid Is?

Ans:  The corret ans is option (c) i.e 2    REASON    for a cuboid of 13x3= 39 cuboids for 1 layer    and also taking the parameter of base it is 13(2x2)+ 3(2x2) = 52+12 =64cm    so total 78 cubes will be used for 39x2 =78    hence the correct answer is 2cubes height