3 small cubes have the sides 3cm, 4cm, 5cm respectively. These are melted to form a large cube. Find the ratio of total surface area of the smaller cubes to that of the larger cube.
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Answer Posted / pradyumna171
Volume of new cube (3*3*3+4*4*4+5*5*5)=216 cubic cm
Side of new cube cube root of 216= 6cm
Therefore total surface of new cube 6*6*6=36 sq cm
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