18. Find the volume of wood required for making the closed box with internal dimension 20 cm  by 12.5 cm by 9.5 cm ; wood 1.25 cm thick.

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length=17.5 cm
width=14 cm
height=10 cm
thickness=7.5 mm =0.75 cm

outer volume= 17.5*14*10
                      = 2450 cm3

open space= (17.5-1.5)*(14-1.5)*(10-0.75)
                  = 16*12.5*9.25
                  = 1850
cm3

volume of wood= 2450-1850
                           = 600
cm3


 
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