Question

Let x cm be the edge of the new cube.

Then, the volume of the new cube= Sum of the volumes of three cubes

⇒x
3
=3
3
+4
3
+5
3
=216

⇒x
3
=6
3
⇒x=6cm

The edge of the new cube is 6cm long.

Surface area of the new cube=6x
2
=6×6
2
cm
2
=216cm
2​

Answer 1

Answer:

Let x cm be the edge of the new cube.

Then, the volume of the new cube= Sum of the volumes of three cubes

⇒x

3

=3

3

+4

3

+5

3

=216

⇒x

3

=6

3

⇒x=6cm

The edge of the new cube is 6cm long.

Surface area of the new cube=6x

2

=6×6

2

cm

2

=216cm

2

Step-by-step explanation:

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Answer 2

Answer:

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