TCS Company Numerical Ability Area and Volume

Susan made a block with small cubes of 5 cubic cm volume to make a block 7 small cubes long, 7 small cubes wide and 6 small cubes deep. She realise that she has used more small cubes than she really needed. She realised that she could have glued a fewer number of cubes together ot look like a block with same dimensions, if it were made

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Volume of cube of dimensions 7 7 6 is 7*7*6=294
If it were to look hollow the imaginary inside cube volume is to be deducted
which is (7-2)*(7-2)*(6-2)=100 (Here 2 is deducted because the inside cube which has to be hollow is 2 cubes more on every dimension)
so minimum number of cubes required to make hollow cube is 294-100=194 cubes
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