A cuboid having volume,l*b*h=6*4*1 cm^3. two faces measuring 4cm*1cm are coloured black,two faces me

A cuboid having volume,l*b*h=6*4*1 cm^3.
Two faces measuring 4cm*1cm are coloured black,two faces measuring 6cm*1cm coloured red,two faces 6cm*4cm are coloured green.The block is divided into 24 equal cubes of side 1cm.
1.How many cubes will remain if the cubes having black and green colours are removed?

8