veena planned to make a jewellery for her friend reeta for her marriage. she made a jewellery box of wood in shape of cuboid .
Answers
Given : veena made a jewellery box of wood in shape of cuboid .
the outer dimension of a jewellery box made of wood are 20cm × 16cm × 8cm the thickness of wood is 1cm.
1cm cube of wood costs rs2.50
To find : the total cost of wood required to make the box
Solution :
jewellery box made of wood are 20cm × 16cm × 8cm
Outer dimensions = 20 x 16 x 8
Outer Volume = 20 x 16 x 8
= 2560 cm³
Thickness = 1 cm
Thickness is all side
Hence Inner dimensions = 18 x 14 x 6
Inner Volume = 1,512 cm³
Volume of wood = 2560 - 1512 = 1048 cm³
1 cm³ wood costs rs 2.50
=> 1048 cm³ wood costs = 1048 x 2.5
= 2,620
total cost of wood required to make the box = rs 2620
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