- 3024 m
^{3} - 3784 m
^{3} - 3658 m3
- 3896 m3

Option 1 : 3024 m^{3}

**Formula used:**

The area of the four walls = 2 (l + b) × h

The volume of the cuboid = l × b × h

Here, l → Length, b → Breadth, h → Height

**Calculation:**

Let the length and breadth of the cuboidal store is 3x and 2x respectively

Height of the cuboidal store h = 3.5

According to the question

Area of four wall = 2 (l + b) × h

2 (l + b) × h = 420

⇒ (3x + 2x) × 3.5 = 210

⇒ 3.5 × 5x = 210

⇒ 17.5x = 210

⇒ x = 210/17.5

⇒ 12

The length of the cuboidal store = 12 × 3 = 36 m

The length of the cuboidal store = 12 × 2 = 24 m

**The volume of the cuboidal store = 36 × 24 × 3.5 = 3024 m ^{3}**

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