Question

three cubes are adjacent to each other(forms a cuboid).
ratio b/w total surface area of cuboid to the 3 cube's tsa=?(i call total surface area-tsa)

Answer 1

3 cubes surface area is $6 x^{2} +6 x^{2} + 6x^{2} = 18 x^{2}$

and surface area of cuboid with side lenghts x and 3x is $14 x^{2}$

where x is side lengths of the cube

SO their ratio is 14:18  i.e. 7:9