The lateral length breadth and height of a closed rectangular wooden box are 18cm, 10cm and 6cm respectively and the thickness of wood is en. when the box is empty it weight 15kg and when filled with sand it weight laxly. The weight of ai Cubic cm of wood and a Cubic cm of sand are respectively.

Class: 9

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255 cm2

365 cm3

344 cm3

None of the above

answer is B.

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Detailed Solution

Detention of a closed rectangular wooden box are 18cm, 10cm and 6cm respectively.
The thickness of wood is cm
∴ Volume of rectangular wooden block = 18 × 10 × 6 = 1080cm2
And, volume of bellow space in rectangular wooden
black = 17 × 9 × 5 = 765cm3
∴ volume of rectangular wood = (1080 – 765)cm3
= 365cm3
Now, weight of empty box = 15kg
weight of of box filled will sand = 100kg
weight of sand = (100 – 15)kg = 85kg
weight of a Cubic cm of sand

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