The volume of a cuboid is 3600 cubic cm. The areas of two adjacent faces are 225 square cm and 144 square cm. What is the area of the other adjacent face ? 

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CDS Elementary Mathematics 16 April 2023 Official Paper
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  1. 400 square cm  
  2. 360 square cm 
  3. 320 square cm  
  4. 300 square cm  

Answer (Detailed Solution Below)

Option 1 : 400 square cm  
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Detailed Solution

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Formula used:

The volume of the cuboid = Length ×  Breadth  × Height  

Calculation:

Let l, b & h be the length, breadth & height of the cuboid.

Volume of cuboid

× b × h = 3600         -----(1)

Let, Area of two adjacent faces are l × h & b × h

According to the question

l × h  = 225

From equation (1)

b × 225 = 3600

b = 16

Again,  

b × h = 144

From equation (1)

l × 144 = 3600

l = 25

Area of another adjacent face 

l × b = 25 × 16 = 400 

∴ The area of the other adjacent face is 400 cm2.

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