What is the area of the whole floor around the outside of a box made of thick wooden planks 12 decimeters long and 7 decimeters wide and 6 decimeters high and 1 decimeter thick?
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Interior dimension are
78−3=75cm
19−3=16cm
& h=3
Interior Volume =75×16×(h−3)
⇒15000cm
3
=75×16×(h−3)
⇒(h−3)=
75×16
15000
=12.5cm
⇒h=12.5+3=15.5cm
∴ Exterior height of box =15.5cm
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