Question

(c)
cuboid
The length, breadth and height of a closed wooden box are 20 cm, 12 cm and
8 cm. The thickness of the wood used to make the box is 10 mm. Find:
(i) the volume of the wood.
(ii) the cost of the wood required to make the box, if 1 cm of wood costs
8.50.

Answer 1

External dimensions are:

Length =20 cm, breadth =12 cm and height =10 cm

Internal dimensions are :

Length =(20−2) cm =18 cm

Breadth =(12−2) cm =10 cm

Height =(10−2) cm =8 cm

∴ volume of wood = External volume − Internal volume

=(20×12×10)cm³ −(18×10×8)cm³

=2400cm³ −1440cm³

=960cm³

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