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DSSSB PGT English Female General Section - 30 June 2021 Shift 1

Option 3 : 20% increase

**Given:**

Length and breadth increase by 100% and height is decreased by 70%

**Concept:**

The volume of cuboid = Length × Breadth × Height

**Calculation:**

Let be assume the length, breadth and height of the cuboid is L, B, and H

⇒ The volume of cuboid before the change = L × B × H = LBH

⇒ The volume of cuboid after the change = 2L × 2B × 0.3H = 1.2LBH

⇒ Percentage change in volume = {(1.2LBH - LBH)/LBH} × (100) = (0.2LBH/LBH) × 100 = 0.2 × 100 = 20% increase

**∴ The required result will be 20% increase.**