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The length, breadth and height of a wooden box with a lid are 10 cm, 9 cm and 7 cm, respectively. The total inner surface of the closed box is 262 cm2. The thickness of the wood (in cm.) is
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- 2
- 3
- 23/3
- 1
- 2
Correct Option: D
Let the thickness of wood = x cm.
∴ Area of the inner surface = 2 (9 – 2x) (10 – 2x) + 2 (9 –2x) (7 – 2x) + 2 (7 – 2x) (10– 2x)= 262
Putting x = 1, the equation is satisfied.
