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Q.

The dimensions of an open box are 50 cm, 40 cm and 23 cm. Its thickness is 3 cm. If 1 cubic cm of metal used in the box weighs 0.5 gms, find the weight of the box.


Sub Grade: 9


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a

6.2 kg

b

12kg

c

7.99 kg

d

8.04 kg 

answer is D.

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Detailed Solution

Volume of box = volume of outer box- volume of empty space
Of outer box = ml*b*h
= 50*40*23 cm3
Of iner empty space l*b*h
44*34*20cm3
Of box = 50*40*23-44*34*20
= 16080 cm3
Of box= 16080*0.5= 8040 gm
= 8.04 kg
  
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