The external length, breadth and height of a closed cubodical wooden box are 20cm,18cm,15cm respectively, the thickness of wooden box is 0.5cm. find the volume of wood
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It is external volume - interal volume
External volume = l*b*h
20*18*15=5400
Internal volume=l*b*h
19*17*14.5=4683.5
Then 5400-4683.5=716.5
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