Question

3 cubes of metal , whose edges are 6cm 8cm and 10 cm are melted and on enew cube isformed .find the total surface area of the new cube.

Answer 1

volume of 3 cubes = volume of new cube
6×6×6+8×8×8+10×10×10
=216+512+1000
=1728
volume of new cube = 1728
side of cube = cube root of 1728 = 12
t.s.a of new cube = 6 a×a
=6×12×12
=144×6
=864cm square
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