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

18. Find the volume of wood required for making the open box with external dimensions 17.5 cm long, 14 cm wide, 10 cm high, wood 7.5 mm thick.

Here ans

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L =20-1.25=18.75
B=1.25-12.5=11.25
H=1.25-9.5=8.25

V = l ? b ? h
= 18.75 ? 11.25 ? 8.25
=. 1693.8281
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