Tips & Tricks Now the volume of cube = (side)3 As three cubes whose edges are 3 cm, 4 cm and 5 cm respectively are melted to from a single cube Volume of first cube =33=27cm3 Volume of second cube =43=64cm3 Volume of second cube =53=125cm3 ∴ Volume of the single resultant cube = 27 + 64 + 125 = 216 cm3 ∴ Side of resultant cube = (216)
1
3
= 6 cm ∴ Surface area of the new cube =6×62=216cm3