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# Internal length, breadth and height of a rectangular box are 10 cm, 8 cm and 6 cm, respectively. How many boxes are needed which can be packed in a cube whose volume is 6240 cu. cm.?

 A) 12 B) 13 C) 15 D) 17

 B) 13

Volume of rectangular box

= $$\Large 10 \times 8 \times 6 = 480 cm^{2}$$

= $$\Large 6240 cm^{3}$$

= $$\Large \frac{Volume \ of \ cubes}{Volume \ of \ rectangular \ box}$$

= $$\Large \frac{6240}{480} = 13$$

Hence, 13 boxes are needed.

Part of solved Volume and surface area questions and answers : >> Elementary Mathematics >> Volume and surface area

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