A closed wooden box 80cm long, 65 cm wide and 45 cm high is made up of wood 2.5 cm thick. Find the weight of the box if 100 cm cube of wood weighs 8 grams.
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l
′
=80−2(2.5)=75cm
b
′
=60cm
h
′
=40cm
[Dimensions of inside of box]
v=l
′
b
′
h
′
=(75)(60)(40)
=180000cm
3
100cm
3
→8g
180000cm
3
→
100
8
×180000
=14400g
Weight=14.4 kg.
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