A cube of 10 cm coloured red with white 2 cm wide green stripe along all the sides of the faces .The cube is cut into 125 smaller cubes of equal sizes. How many cubes have at least two green faces each??

Dear Student,

On analysing the figure given above, we calculate the number of cubes which have atleast 2 sides painted as follows:
16 cubes from the top the large cube, 
16 cubes from the bottom of the large,
3 cubes from each of the 4 side (in height),{ because 2 cubes out of each 5 cubes on each height side have been included in the top and bottom cubes }
= 16+16+(3×4) = 16+16+12= 44 cubes Ans. 


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