Question : The area of 4 walls of a cuboid is 400 sq. cm. Its length is 15 cm and its height is 8 cm. What is its breadth (in cm)?
Option 1: 12
Option 2: 20
Option 3: 24
Option 4: 10
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Correct Answer: 10
Solution : Area of 4 walls of a cuboid = 400 sq. cm. Length(l) = 15 cm Height(h) = 8 cm Let b be the breadth. Area of 4 walls of a cuboidal room = 2(l + b) × h ⇒ 400 = 2(15 + b) × 8 ⇒ 400 = 240 + 16b ⇒ 16b = 160 ⇒ b = 10 cm Hence, the correct answer is 10.
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