Question

How many lead cubes of side 2cm could be made from a lead cube of side 8 cm.

Answer 1

no of cubes = ( 8 × 8 × 8 )/ ( 2 × 2 × 2 )
= 64 .

Answer 2

vol. of bigger cube = A^3
                              = 8*8*8
vol. of smaller cube = a^3
                                = 2*2*2

     vol. of bigger cube = vol. of smaller cube * n    ( n = no. of lead cubes)
                        8*8*8   =    2*2*2 * n
                               n   = 4*4*4  
                               n   = 64
 therefore, 
                64 lead cubes can be made from the bigger cube .