- 10
- 12
- 18
- 15

Option 4 : 15

**Given:**

The total surface area of the cube = 6 × side^{2}

The volume of the cube = Side^{3}

The volume of the cuboid = Length × breadth × height

**Calculation:**

The total surface area of the cubical box = 1350 cm^{2}

⇒ 6 × side^{2} = 1350

⇒ Side^{2} = 225

⇒ Side = 15 cm ----(Negative value is neglected)

The volume of the cuboidal box = Side^{3}

⇒ 15 × 15 × 15 cm^{3}

Total number of the books = (Volume of the box)/(Volume of the book)

⇒ (15 × 15 × 15)/(15 × 5 × 3)

⇒ 15

**∴ The total number of books filled in the box is 15**

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