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Volume of old cube =a³ ⇒(12)³=1728 cm³ No.of cubes =8 Volume of old cube = 8* volume of 1 new cube 1728=8*a³ 1728/8=a³ 12/2=a 6 cm=a Surface area of old cube/ surface area of new cube=6*(12)²/6*(6)² =144/36=4/1=4:1

surface area of a cube = 6a square, then the surface area of older cube = 6 * 12square =>864 sq.cm and the surface area of new cube = 6* 6 square =>216

arre you have cancelled the 6 on both numerator and denominator . I am REALLY SORRY. Nice job

Side of a large cube(a) = 12cm volume of the cube = (12³)cm³ => 1728 cm³ eight small cubes of equal volumes are cut from the larger one ∴volume of larger cube = 8* volume of one small cube. =>1728 = 8 * volume of small cube =>1728/8 = volume of small cube ∴volume of one small cube = 216. then side of the smaller cube = ∛216 = 6cm The ratio of surface area of larger cube and small cube = 864:216 = 4:1