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Question

A closed wooden box 80 cm long, 65 cm wide and 45 cm high, is made of 2.5 cm-thick wood. Find the capacity of the box and its weight if 100cm3 of wood weighs 8 g.

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Solution

Outer length =80 cm.

Outer width =65 cm.

Outer height =45 cm.

Total volume =80×65×45cm3

=234000cm3

Thickness of wood =2.5 cm.

Inner length =802×2.5=75cm.

Inner width =652×2.5=60 cm.

Inner height =452×2.5=40 cm.

(i)\therefore Inner capacity (volume)

=75×60×40cm33=180000cm3

Volume of wood =234000180000

=54000cm3

Weight of wood =54000×8100g

=4320g=4.320kg


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