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The external length, breadth and height of a closed box are 10 cm, 9 cm and 7 cm respectively. The AB total inner surface area of the box is 262 sq. cm. Find the thickness of walls of box.

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The external length, breadth and height of a closed box are 10 cm, 9 cm and 7 cm respectively. The AB total inner surface area of the box is 262 sq. cm. Find the thickness of walls of box.






 
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