A cuboid of length 36 m, breadth 18 m and height 9 m is melted and recast into a cube. Find the length of the diagonal of the cube.

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SSC CGL 2022 Tier-I Official Paper (Held On : 02 Dec 2022 Shift 3)
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  1. 18 √3 m
  2. 15 √3 m
  3. 12 √3 m
  4. 17 √3 m

Answer (Detailed Solution Below)

Option 1 : 18 √3 m
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Detailed Solution

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Given:

A cuboid of length 36 m, breadth 18 m and height 9 m is melted and recast into a cube.

Concept used:

Volume of cuboid = L × H × B

Volume of cube = a3

Here,

L = Lenght

B = breadth

H = height

a = side of the cube

Calculation:

Let the side of the cubes to be formed be a

According to the question,

Volume of cuboid = volume of the cube

So,

36 × 18 × 9 = a3 

5832 = a3 

⇒ a3 = 183

⇒ a = 18

So, the diagonal of the cube is 18√3

∴ The length of the diagonal of the cube is 18√3.

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