Three solid cubes of sides 1 cm, 6 cm and 8 cm are melted to form a new cube. Find the surface area of the cube so formed.
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Answer:
Volume of cube = (side)³
Sum of volume of all cubes = 1³ + 6³ + 8³
= 1 + 216 + 512 = 729 cm³
Let side of new cube = a cm
Volume = a³
=> a³ = 729
=> a = 9cm
Side of new cube is 9cm
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